91012901381 has 4 divisors (see below), whose sum is σ = 91038782892. Its totient is φ = 90987019872.

The previous prime is 91012901351. The next prime is 91012901389. The reversal of 91012901381 is 18310921019.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41793260356 + 49219641025 = 204434^2 + 221855^2 .

It is a cyclic number.

It is not a de Polignac number, because 91012901381 - 2¹⁴ = 91012884997 is a prime.

It is a super-2 number, since 2×91012901381² (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 (91012901389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12935480 + ... + 12942513.

It is an arithmetic number, because the mean of its divisors is an integer number (22759695723).

Almost surely, 2^91012901381 is an apocalyptic number.

It is an amenable number.

91012901381 is a deficient number, since it is larger than the sum of its proper divisors (25881511).

91012901381 is a wasteful number, since it uses less digits than its factorization.

91012901381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25881510.

The product of its (nonzero) digits is 3888, while the sum is 35.

The spelling of 91012901381 in words is "ninety-one billion, twelve million, nine hundred one thousand, three hundred eighty-one".