55921497 has 4 divisors (see below), whose sum is σ = 74562000. Its totient is φ = 37280996.

The previous prime is 55921423. The next prime is 55921501. The reversal of 55921497 is 79412955.

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.

It is a cyclic number.

It is not a de Polignac number, because 55921497 - 2¹² = 55917401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55921597) 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, 9320247 + ... + 9320252.

It is an arithmetic number, because the mean of its divisors is an integer number (18640500).

Almost surely, 2^55921497 is an apocalyptic number.

It is an amenable number.

55921497 is a deficient number, since it is larger than the sum of its proper divisors (18640503).

55921497 is a wasteful number, since it uses less digits than its factorization.

55921497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18640502.

The product of its digits is 113400, while the sum is 42.

The square root of 55921497 is about 7478.0677317072. The cubic root of 55921497 is about 382.4073781460.

The spelling of 55921497 in words is "fifty-five million, nine hundred twenty-one thousand, four hundred ninety-seven".