55731623 has 2 divisors, whose sum is σ = 55731624. Its totient is φ = 55731622.

The previous prime is 55731619. The next prime is 55731647. The reversal of 55731623 is 32613755.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55731623 - 2² = 55731619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55731623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55731653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27865811 + 27865812.

It is an arithmetic number, because the mean of its divisors is an integer number (27865812).

Almost surely, 2^55731623 is an apocalyptic number.

55731623 is a deficient number, since it is larger than the sum of its proper divisors (1).

55731623 is an equidigital number, since it uses as much as digits as its factorization.

55731623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 32.

The square root of 55731623 is about 7465.3615451631. The cubic root of 55731623 is about 381.9740829250.

The spelling of 55731623 in words is "fifty-five million, seven hundred thirty-one thousand, six hundred twenty-three".