91631345 has 8 divisors (see below), whose sum is σ = 118415976. Its totient is φ = 67666176.

The previous prime is 91631339. The next prime is 91631347. The reversal of 91631345 is 54313619.

It can be written as a sum of positive squares in 4 ways, for example, as 6105841 + 85525504 = 2471^2 + 9248^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91631345 - 2¹⁴ = 91614961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91631347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 704792 + ... + 704921.

It is an arithmetic number, because the mean of its divisors is an integer number (14801997).

Almost surely, 2^91631345 is an apocalyptic number.

It is an amenable number.

91631345 is a deficient number, since it is larger than the sum of its proper divisors (26784631).

91631345 is a wasteful number, since it uses less digits than its factorization.

91631345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409731.

The product of its digits is 9720, while the sum is 32.

The square root of 91631345 is about 9572.4262859528. The cubic root of 91631345 is about 450.8319506709.

The spelling of 91631345 in words is "ninety-one million, six hundred thirty-one thousand, three hundred forty-five".