91249613 has 12 divisors (see below), whose sum is σ = 114313500. Its totient is φ = 72196992.

The previous prime is 91249603. The next prime is 91249633. The reversal of 91249613 is 31694219.

It can be written as a sum of positive squares in 2 ways, for example, as 24631369 + 66618244 = 4963^2 + 8162^2 .

It is not a de Polignac number, because 91249613 - 2⁴ = 91249597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91249603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70988 + ... + 72261.

It is an arithmetic number, because the mean of its divisors is an integer number (9526125).

Almost surely, 2^91249613 is an apocalyptic number.

It is an amenable number.

91249613 is a deficient number, since it is larger than the sum of its proper divisors (23063887).

91249613 is a wasteful number, since it uses less digits than its factorization.

91249613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143276 (or 143269 counting only the distinct ones).

The product of its digits is 11664, while the sum is 35.

The square root of 91249613 is about 9552.4663307441. The cubic root of 91249613 is about 450.2050308487.

The spelling of 91249613 in words is "ninety-one million, two hundred forty-nine thousand, six hundred thirteen".