91398075 has 48 divisors (see below), whose sum is σ = 164275200. Its totient is φ = 44668800.

The previous prime is 91398071. The next prime is 91398101. The reversal of 91398075 is 57089319.

It is a happy number.

It is not a de Polignac number, because 91398075 - 2² = 91398071 is a prime.

It is a super-2 number, since 2×91398075² = 16707216227411250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91398071) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43141 + ... + 45209.

It is an arithmetic number, because the mean of its divisors is an integer number (3422400).

Almost surely, 2^91398075 is an apocalyptic number.

91398075 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

91398075 is a deficient number, since it is larger than the sum of its proper divisors (72877125).

91398075 is a wasteful number, since it uses less digits than its factorization.

91398075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132 (or 2127 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 91398075 is about 9560.2340452522. The cubic root of 91398075 is about 450.4490579060.

The spelling of 91398075 in words is "ninety-one million, three hundred ninety-eight thousand, seventy-five".