91407020385 has 16 divisors (see below), whose sum is σ = 146274981696. Its totient is φ = 48742494528.

The previous prime is 91407020381. The next prime is 91407020399. The reversal of 91407020385 is 58302070419.

It is not a de Polignac number, because 91407020385 - 2² = 91407020381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91407020381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 398719 + ... + 584628.

It is an arithmetic number, because the mean of its divisors is an integer number (9142186356).

Almost surely, 2^91407020385 is an apocalyptic number.

It is an amenable number.

91407020385 is a deficient number, since it is larger than the sum of its proper divisors (54867961311).

91407020385 is a wasteful number, since it uses less digits than its factorization.

91407020385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989552.

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 91407020385 in words is "ninety-one billion, four hundred seven million, twenty thousand, three hundred eighty-five".