185038485921 has 9 divisors (see below), whose sum is σ = 267279677041. Its totient is φ = 123358130292.

The previous prime is 185038485913. The next prime is 185038485943. The reversal of 185038485921 is 129584830581.

The square root of 185038485921 is 430161.

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

185038485921 is a `hidden beast` number, since 1 + 8 + 5 + 0 + 3 + 8 + 48 + 592 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 185038485921 - 2³ = 185038485913 is a prime.

It is a super-2 number, since 2×185038485921² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (185038485221) 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, 1218790 + ... + 1362176.

Almost surely, 2^185038485921 is an apocalyptic number.

185038485921 is the 430161-st square number.

185038485921 is the 215081-st centered octagonal number.

It is an amenable number.

185038485921 is a deficient number, since it is larger than the sum of its proper divisors (82241191120).

185038485921 is an frugal number, since it uses more digits than its factorization.

185038485921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286780 (or 143390 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 54.

The spelling of 185038485921 in words is "one hundred eighty-five billion, thirty-eight million, four hundred eighty-five thousand, nine hundred twenty-one".