189621051911 has 6 divisors (see below), whose sum is σ = 192295491912. Its totient is φ = 186946715340.

The previous prime is 189621051899. The next prime is 189621051929. The reversal of 189621051911 is 119150126981.

It is not a de Polignac number, because 189621051911 - 2¹⁰ = 189621050887 is a prime.

It is a super-2 number, since 2×189621051911² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189621051511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3643370 + ... + 3695048.

It is an arithmetic number, because the mean of its divisors is an integer number (32049248652).

Almost surely, 2^189621051911 is an apocalyptic number.

189621051911 is a deficient number, since it is larger than the sum of its proper divisors (2674440001).

189621051911 is an frugal number, since it uses more digits than its factorization.

189621051911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103429 (or 51750 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 44.

The spelling of 189621051911 in words is "one hundred eighty-nine billion, six hundred twenty-one million, fifty-one thousand, nine hundred eleven".