53903991 has 24 divisors (see below), whose sum is σ = 77413120. Its totient is φ = 33351552.

The previous prime is 53903989. The next prime is 53903999. The reversal of 53903991 is 19930935.

It is not a de Polignac number, because 53903991 - 2¹ = 53903989 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 (53903999) 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, 68100 + ... + 68886.

Almost surely, 2^53903991 is an apocalyptic number.

53903991 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

53903991 is a deficient number, since it is larger than the sum of its proper divisors (23509129).

53903991 is a wasteful number, since it uses less digits than its factorization.

53903991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903 (or 886 counting only the distinct ones).

The product of its (nonzero) digits is 32805, while the sum is 39.

The square root of 53903991 is about 7341.9337371022. The cubic root of 53903991 is about 377.7521751168.

The spelling of 53903991 in words is "fifty-three million, nine hundred three thousand, nine hundred ninety-one".