185193157481 has 2 divisors, whose sum is σ = 185193157482. Its totient is φ = 185193157480.

The previous prime is 185193157447. The next prime is 185193157483. The reversal of 185193157481 is 184751391581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178498645081 + 6694512400 = 422491^2 + 81820^2 .

It is a cyclic number.

It is not a de Polignac number, because 185193157481 - 2²² = 185188963177 is a prime.

It is a super-2 number, since 2×185193157481² (a number of 23 digits) contains 22 as substring.

Together with 185193157483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (185193157483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92596578740 + 92596578741.

It is an arithmetic number, because the mean of its divisors is an integer number (92596578741).

Almost surely, 2^185193157481 is an apocalyptic number.

It is an amenable number.

185193157481 is a deficient number, since it is larger than the sum of its proper divisors (1).

185193157481 is an equidigital number, since it uses as much as digits as its factorization.

185193157481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1209600, while the sum is 53.

The spelling of 185193157481 in words is "one hundred eighty-five billion, one hundred ninety-three million, one hundred fifty-seven thousand, four hundred eighty-one".