53863691 has 8 divisors (see below), whose sum is σ = 62815200. Its totient is φ = 46168584.

The previous prime is 53863687. The next prime is 53863699. The reversal of 53863691 is 19636835.

It is not a de Polignac number, because 53863691 - 2² = 53863687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53863699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78176 + ... + 78861.

It is an arithmetic number, because the mean of its divisors is an integer number (7851900).

Almost surely, 2^53863691 is an apocalyptic number.

53863691 is a deficient number, since it is larger than the sum of its proper divisors (8951509).

53863691 is an equidigital number, since it uses as much as digits as its factorization.

53863691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157058 (or 157044 counting only the distinct ones).

The product of its digits is 116640, while the sum is 41.

The square root of 53863691 is about 7339.1887153826. The cubic root of 53863691 is about 377.6580125897.

The spelling of 53863691 in words is "fifty-three million, eight hundred sixty-three thousand, six hundred ninety-one".