91506451 has 16 divisors (see below), whose sum is σ = 101770240. Its totient is φ = 81920160.

The previous prime is 91506431. The next prime is 91506469. The reversal of 91506451 is 15460519.

It is not a de Polignac number, because 91506451 - 2⁵ = 91506419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91506431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23521 + ... + 27133.

It is an arithmetic number, because the mean of its divisors is an integer number (6360640).

Almost surely, 2^91506451 is an apocalyptic number.

91506451 is a deficient number, since it is larger than the sum of its proper divisors (10263789).

91506451 is a wasteful number, since it uses less digits than its factorization.

91506451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3706.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 91506451 is about 9565.9004280831. The cubic root of 91506451 is about 450.6270287747.

The spelling of 91506451 in words is "ninety-one million, five hundred six thousand, four hundred fifty-one".