55531513 has 2 divisors, whose sum is σ = 55531514. Its totient is φ = 55531512.

The previous prime is 55531457. The next prime is 55531529. The reversal of 55531513 is 31513555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43718544 + 11812969 = 6612^2 + 3437^2 .

It is a cyclic number.

It is not a de Polignac number, because 55531513 - 2⁹ = 55531001 is a prime.

It is equal to p_3311992 and since 55531513 and 3311992 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (55531583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27765756 + 27765757.

It is an arithmetic number, because the mean of its divisors is an integer number (27765757).

Almost surely, 2^55531513 is an apocalyptic number.

It is an amenable number.

55531513 is a deficient number, since it is larger than the sum of its proper divisors (1).

55531513 is an equidigital number, since it uses as much as digits as its factorization.

55531513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5625, while the sum is 28.

The square root of 55531513 is about 7451.9469268105. The cubic root of 55531513 is about 381.5163625306.

The spelling of 55531513 in words is "fifty-five million, five hundred thirty-one thousand, five hundred thirteen".