91621442 has 12 divisors (see below), whose sum is σ = 151062198. Its totient is φ = 41646000.

The previous prime is 91621403. The next prime is 91621463. The reversal of 91621442 is 24412619.

It can be written as a sum of positive squares in only one way, i.e., 89283601 + 2337841 = 9449^2 + 1529^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 189059 + ... + 189542.

Almost surely, 2^91621442 is an apocalyptic number.

91621442 is a deficient number, since it is larger than the sum of its proper divisors (59440756).

91621442 is a wasteful number, since it uses less digits than its factorization.

91621442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378625 (or 378614 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 91621442 is about 9571.9090050000. The cubic root of 91621442 is about 450.8157089593.

The spelling of 91621442 in words is "ninety-one million, six hundred twenty-one thousand, four hundred forty-two".