55517431 has 2 divisors, whose sum is σ = 55517432. Its totient is φ = 55517430.

The previous prime is 55517417. The next prime is 55517443. The reversal of 55517431 is 13471555.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55517431 - 2⁹ = 55516919 is a prime.

It is a super-2 number, since 2×55517431² = 6164370289679522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 55517393 and 55517402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55517471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27758715 + 27758716.

It is an arithmetic number, because the mean of its divisors is an integer number (27758716).

Almost surely, 2^55517431 is an apocalyptic number.

55517431 is a deficient number, since it is larger than the sum of its proper divisors (1).

55517431 is an equidigital number, since it uses as much as digits as its factorization.

55517431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10500, while the sum is 31.

The square root of 55517431 is about 7451.0020131523. The cubic root of 55517431 is about 381.4841107675.

Adding to 55517431 its reverse (13471555), we get a palindrome (68988986).

The spelling of 55517431 in words is "fifty-five million, five hundred seventeen thousand, four hundred thirty-one".