91274789 has 4 divisors (see below), whose sum is σ = 92161056. Its totient is φ = 90388524.

The previous prime is 91274779. The next prime is 91274791. The reversal of 91274789 is 98747219.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91274789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91274719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442979 + ... + 443184.

It is an arithmetic number, because the mean of its divisors is an integer number (23040264).

Almost surely, 2^91274789 is an apocalyptic number.

It is an amenable number.

91274789 is a deficient number, since it is larger than the sum of its proper divisors (886267).

91274789 is a wasteful number, since it uses less digits than its factorization.

91274789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886266.

The product of its digits is 254016, while the sum is 47.

The square root of 91274789 is about 9553.7840147242. The cubic root of 91274789 is about 450.2464312786.

The spelling of 91274789 in words is "ninety-one million, two hundred seventy-four thousand, seven hundred eighty-nine".