91939949 has 4 divisors (see below), whose sum is σ = 92453760. Its totient is φ = 91426140.

The previous prime is 91939919. The next prime is 91939957. The reversal of 91939949 is 94993919.

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: 94993919 = 8971 ⋅10589.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91939949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91939949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91939919) 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, 256637 + ... + 256994.

It is an arithmetic number, because the mean of its divisors is an integer number (23113440).

Almost surely, 2^91939949 is an apocalyptic number.

It is an amenable number.

91939949 is a deficient number, since it is larger than the sum of its proper divisors (513811).

91939949 is a wasteful number, since it uses less digits than its factorization.

91939949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513810.

The product of its digits is 708588, while the sum is 53.

The square root of 91939949 is about 9588.5321608680. The cubic root of 91939949 is about 451.3375005464.

The spelling of 91939949 in words is "ninety-one million, nine hundred thirty-nine thousand, nine hundred forty-nine".