190934915521 has 9 divisors (see below), whose sum is σ = 222111521121. Its totient is φ = 163655877252.

The previous prime is 190934915491. The next prime is 190934915533. The reversal of 190934915521 is 125519439091.

The square root of 190934915521 is 436961.

It is a perfect power (a square), and thus also a powerful number.

190934915521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 190934915521 - 2⁷ = 190934915393 is a prime.

It is a super-2 number, since 2×190934915521² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (190934915221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3027516 + ... + 3089938.

Almost surely, 2^190934915521 is an apocalyptic number.

190934915521 is the 436961-st square number.

190934915521 is the 218481-st centered octagonal number.

It is an amenable number.

190934915521 is a deficient number, since it is larger than the sum of its proper divisors (31176605600).

190934915521 is an frugal number, since it uses more digits than its factorization.

190934915521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124860 (or 62430 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 49.

Multiplying 190934915521 by its sum of digits (49), we get a square (9355810860529 = 3058727²).

190934915521 divided by its sum of digits (49) gives a square (3896630929 = 62423²).

The spelling of 190934915521 in words is "one hundred ninety billion, nine hundred thirty-four million, nine hundred fifteen thousand, five hundred twenty-one".