55710991 has 12 divisors (see below), whose sum is σ = 67625712. Its totient is φ = 45675168.

The previous prime is 55710973. The next prime is 55711013. The reversal of 55710991 is 19901755.

It is a happy number.

It is not a de Polignac number, because 55710991 - 2⁵ = 55710959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55710991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55710901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23590 + ... + 25843.

It is an arithmetic number, because the mean of its divisors is an integer number (5635476).

Almost surely, 2^55710991 is an apocalyptic number.

55710991 is a deficient number, since it is larger than the sum of its proper divisors (11914721).

55710991 is a wasteful number, since it uses less digits than its factorization.

55710991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49470 (or 49463 counting only the distinct ones).

The product of its (nonzero) digits is 14175, while the sum is 37.

The square root of 55710991 is about 7463.9795685680. The cubic root of 55710991 is about 381.9269411555.

The spelling of 55710991 in words is "fifty-five million, seven hundred ten thousand, nine hundred ninety-one".