55447831 has 2 divisors, whose sum is σ = 55447832. Its totient is φ = 55447830.

The previous prime is 55447813. The next prime is 55447837. The reversal of 55447831 is 13874455.

Together with previous prime (55447813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55447831 - 2¹³ = 55439639 is a prime.

It is a super-2 number, since 2×55447831² = 6148923925209122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55447837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27723915 + 27723916.

It is an arithmetic number, because the mean of its divisors is an integer number (27723916).

Almost surely, 2^55447831 is an apocalyptic number.

55447831 is a deficient number, since it is larger than the sum of its proper divisors (1).

55447831 is an equidigital number, since it uses as much as digits as its factorization.

55447831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 37.

The square root of 55447831 is about 7446.3300356619. The cubic root of 55447831 is about 381.3246269393.

The spelling of 55447831 in words is "fifty-five million, four hundred forty-seven thousand, eight hundred thirty-one".