55057531 has 2 divisors, whose sum is σ = 55057532. Its totient is φ = 55057530.

The previous prime is 55057507. The next prime is 55057537. The reversal of 55057531 is 13575055.

55057531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55057531 - 2¹³ = 55049339 is a prime.

It is a super-2 number, since 2×55057531² = 6062663439631922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55057493 and 55057502.

It is not a weakly prime, because it can be changed into another prime (55057537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27528765 + 27528766.

It is an arithmetic number, because the mean of its divisors is an integer number (27528766).

Almost surely, 2^55057531 is an apocalyptic number.

55057531 is a deficient number, since it is larger than the sum of its proper divisors (1).

55057531 is an equidigital number, since it uses as much as digits as its factorization.

55057531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13125, while the sum is 31.

The square root of 55057531 is about 7420.0762125466. The cubic root of 55057531 is about 380.4277984501.

It can be divided in two parts, 550 and 57531, that added together give a square (58081 = 241²).

The spelling of 55057531 in words is "fifty-five million, fifty-seven thousand, five hundred thirty-one".