55515497 has 2 divisors, whose sum is σ = 55515498. Its totient is φ = 55515496.

The previous prime is 55515479. The next prime is 55515529. The reversal of 55515497 is 79451555.

Together with previous prime (55515479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34621456 + 20894041 = 5884^2 + 4571^2 .

It is a cyclic number.

It is not a de Polignac number, because 55515497 - 2⁸ = 55515241 is a prime.

It is not a weakly prime, because it can be changed into another prime (55515437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27757748 + 27757749.

It is an arithmetic number, because the mean of its divisors is an integer number (27757749).

Almost surely, 2^55515497 is an apocalyptic number.

It is an amenable number.

55515497 is a deficient number, since it is larger than the sum of its proper divisors (1).

55515497 is an equidigital number, since it uses as much as digits as its factorization.

55515497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157500, while the sum is 41.

The square root of 55515497 is about 7450.8722308197. The cubic root of 55515497 is about 381.4796809345.

The spelling of 55515497 in words is "fifty-five million, five hundred fifteen thousand, four hundred ninety-seven".