91900949 has 4 divisors (see below), whose sum is σ = 105029664. Its totient is φ = 78772236.

The previous prime is 91900943. The next prime is 91900969. The reversal of 91900949 is 94900919.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94900919 = 17 ⋅5582407.

It is a cyclic number.

It is not a de Polignac number, because 91900949 - 2⁸ = 91900693 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 (91900943) 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 3 ways as a sum of consecutive naturals, for example, 6564347 + ... + 6564360.

It is an arithmetic number, because the mean of its divisors is an integer number (26257416).

Almost surely, 2^91900949 is an apocalyptic number.

It is an amenable number.

91900949 is a deficient number, since it is larger than the sum of its proper divisors (13128715).

91900949 is a wasteful number, since it uses less digits than its factorization.

91900949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13128714.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 91900949 is about 9586.4982657903. The cubic root of 91900949 is about 451.2736739139.

The spelling of 91900949 in words is "ninety-one million, nine hundred thousand, nine hundred forty-nine".