91290042 has 12 divisors (see below), whose sum is σ = 197795130. Its totient is φ = 30430008.

The previous prime is 91290037. The next prime is 91290047. The reversal of 91290042 is 24009219.

It is an interprime number because it is at equal distance from previous prime (91290037) and next prime (91290047).

It can be written as a sum of positive squares in only one way, i.e., 78694641 + 12595401 = 8871^2 + 3549^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91289988 and 91290015.

It is not an unprimeable number, because it can be changed into a prime (91290047) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2535817 + ... + 2535852.

Almost surely, 2^91290042 is an apocalyptic number.

91290042 is an abundant number, since it is smaller than the sum of its proper divisors (106505088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91290042 is a wasteful number, since it uses less digits than its factorization.

91290042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5071677 (or 5071674 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 91290042 is about 9554.5822514645. The cubic root of 91290042 is about 450.2715102238.

The spelling of 91290042 in words is "ninety-one million, two hundred ninety thousand, forty-two".