187411933921 has 9 divisors (see below), whose sum is σ = 189406373331. Its totient is φ = 185438292672.

The previous prime is 187411933909. The next prime is 187411933931. The reversal of 187411933921 is 129339114781.

The square root of 187411933921 is 432911.

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

It can be written as a sum of positive squares in only one way, i.e., 84155109025 + 103256824896 = 290095^2 + 321336^2 .

It is not a de Polignac number, because 187411933921 - 2¹⁵ = 187411901153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187411933931) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 41990136 + ... + 41994598.

Almost surely, 2^187411933921 is an apocalyptic number.

187411933921 is the 432911-st square number.

187411933921 is the 216456-th centered octagonal number.

It is an amenable number.

187411933921 is a deficient number, since it is larger than the sum of its proper divisors (1994439410).

187411933921 is an frugal number, since it uses more digits than its factorization.

187411933921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9120 (or 4560 counting only the distinct ones).

The product of its digits is 326592, while the sum is 49.

Multiplying 187411933921 by its sum of digits (49), we get a square (9183184762129 = 3030377²).

The spelling of 187411933921 in words is "one hundred eighty-seven billion, four hundred eleven million, nine hundred thirty-three thousand, nine hundred twenty-one".