49697991 has 24 divisors (see below), whose sum is σ = 84690944. Its totient is φ = 27481680.

The previous prime is 49697951. The next prime is 49698007. The reversal of 49697991 is 19979694.

It is not a de Polignac number, because 49697991 - 2⁶ = 49697927 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 (49697911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10771 + ... + 14676.

Almost surely, 2^49697991 is an apocalyptic number.

49697991 is a deficient number, since it is larger than the sum of its proper divisors (34992953).

49697991 is a wasteful number, since it uses less digits than its factorization.

49697991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25491 (or 25488 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The square root of 49697991 is about 7049.6802055129. The cubic root of 49697991 is about 367.6599109712.

The spelling of 49697991 in words is "forty-nine million, six hundred ninety-seven thousand, nine hundred ninety-one".