55506931 has 2 divisors, whose sum is σ = 55506932. Its totient is φ = 55506930.

The previous prime is 55506883. The next prime is 55506947. The reversal of 55506931 is 13960555.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55506931 - 2⁹ = 55506419 is a prime.

It is a super-2 number, since 2×55506931² = 6162038778077522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55506991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27753465 + 27753466.

It is an arithmetic number, because the mean of its divisors is an integer number (27753466).

Almost surely, 2^55506931 is an apocalyptic number.

55506931 is a deficient number, since it is larger than the sum of its proper divisors (1).

55506931 is an equidigital number, since it uses as much as digits as its factorization.

55506931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20250, while the sum is 34.

The square root of 55506931 is about 7450.2973766152. The cubic root of 55506931 is about 381.4600592481.

The spelling of 55506931 in words is "fifty-five million, five hundred six thousand, nine hundred thirty-one".