55772531 has 4 divisors (see below), whose sum is σ = 55951032. Its totient is φ = 55594032.

The previous prime is 55772501. The next prime is 55772533. The reversal of 55772531 is 13527755.

55772531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55772531 is a prime.

It is a super-2 number, since 2×55772531² = 6221150428291922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55772491 and 55772500.

It is not an unprimeable number, because it can be changed into a prime (55772533) 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 in 3 ways as a sum of consecutive naturals, for example, 88781 + ... + 89406.

It is an arithmetic number, because the mean of its divisors is an integer number (13987758).

Almost surely, 2^55772531 is an apocalyptic number.

55772531 is a deficient number, since it is larger than the sum of its proper divisors (178501).

55772531 is a wasteful number, since it uses less digits than its factorization.

55772531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178500.

The product of its digits is 36750, while the sum is 35.

The square root of 55772531 is about 7468.1008964796. The cubic root of 55772531 is about 382.0675186520.

The spelling of 55772531 in words is "fifty-five million, seven hundred seventy-two thousand, five hundred thirty-one".