55573631 has 2 divisors, whose sum is σ = 55573632. Its totient is φ = 55573630.

The previous prime is 55573621. The next prime is 55573633. The reversal of 55573631 is 13637555.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55573631 is a prime.

It is a super-2 number, since 2×55573631² = 6176856925048322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 55573633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 55573591 and 55573600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55573633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27786815 + 27786816.

It is an arithmetic number, because the mean of its divisors is an integer number (27786816).

Almost surely, 2^55573631 is an apocalyptic number.

55573631 is a deficient number, since it is larger than the sum of its proper divisors (1).

55573631 is an equidigital number, since it uses as much as digits as its factorization.

55573631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47250, while the sum is 35.

The square root of 55573631 is about 7454.7723640632. The cubic root of 55573631 is about 381.6127921346.

The spelling of 55573631 in words is "fifty-five million, five hundred seventy-three thousand, six hundred thirty-one".