55771907 has 4 divisors (see below), whose sum is σ = 55786896. Its totient is φ = 55756920.

The previous prime is 55771879. The next prime is 55771909. The reversal of 55771907 is 70917755.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 55771907 - 2¹⁸ = 55509763 is a prime.

It is a super-2 number, since 2×55771907² = 6221011220833298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55771909) 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, 2813 + ... + 10929.

It is an arithmetic number, because the mean of its divisors is an integer number (13946724).

Almost surely, 2^55771907 is an apocalyptic number.

55771907 is a deficient number, since it is larger than the sum of its proper divisors (14989).

55771907 is an equidigital number, since it uses as much as digits as its factorization.

55771907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14988.

The product of its (nonzero) digits is 77175, while the sum is 41.

The square root of 55771907 is about 7468.0591186733. The cubic root of 55771907 is about 382.0660937510.

The spelling of 55771907 in words is "fifty-five million, seven hundred seventy-one thousand, nine hundred seven".