231540777091 has 32 divisors (see below), whose sum is σ = 266412041280. Its totient is φ = 199451289600.

The previous prime is 231540777077. The next prime is 231540777119. The reversal of 231540777091 is 190777045132.

It is a cyclic number.

It is not a de Polignac number, because 231540777091 - 2¹⁷ = 231540646019 is a prime.

It is a super-2 number, since 2×231540777091² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231540777791) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14795631 + ... + 14811271.

It is an arithmetic number, because the mean of its divisors is an integer number (8325376290).

Almost surely, 2^231540777091 is an apocalyptic number.

231540777091 is a deficient number, since it is larger than the sum of its proper divisors (34871264189).

231540777091 is a wasteful number, since it uses less digits than its factorization.

231540777091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16567.

The product of its (nonzero) digits is 370440, while the sum is 46.

The spelling of 231540777091 in words is "two hundred thirty-one billion, five hundred forty million, seven hundred seventy-seven thousand, ninety-one".