91009437 has 16 divisors (see below), whose sum is σ = 124422912. Its totient is φ = 59144960.

The previous prime is 91009403. The next prime is 91009481. The reversal of 91009437 is 73490019.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91009437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91009398 and 91009407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91009637) 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, 38473 + ... + 40769.

It is an arithmetic number, because the mean of its divisors is an integer number (7776432).

Almost surely, 2^91009437 is an apocalyptic number.

It is an amenable number.

91009437 is a deficient number, since it is larger than the sum of its proper divisors (33413475).

91009437 is a wasteful number, since it uses less digits than its factorization.

91009437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 91009437 is about 9539.8866345466. The cubic root of 91009437 is about 449.8096923686.

The spelling of 91009437 in words is "ninety-one million, nine thousand, four hundred thirty-seven".