91359027981 has 32 divisors (see below), whose sum is σ = 145932192000. Its totient is φ = 56153749824.

The previous prime is 91359027923. The next prime is 91359027997. The reversal of 91359027981 is 18972095319.

It is not a de Polignac number, because 91359027981 - 2⁶ = 91359027917 is a prime.

It is a super-2 number, since 2×91359027981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91359027481) 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, 139375 + ... + 449603.

It is an arithmetic number, because the mean of its divisors is an integer number (4560381000).

Almost surely, 2^91359027981 is an apocalyptic number.

It is an amenable number.

91359027981 is a deficient number, since it is larger than the sum of its proper divisors (54573164019).

91359027981 is a wasteful number, since it uses less digits than its factorization.

91359027981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311090 (or 311084 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 54.

The spelling of 91359027981 in words is "ninety-one billion, three hundred fifty-nine million, twenty-seven thousand, nine hundred eighty-one".