55315397 has 2 divisors, whose sum is σ = 55315398. Its totient is φ = 55315396.

The previous prime is 55315367. The next prime is 55315409. The reversal of 55315397 is 79351355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49928356 + 5387041 = 7066^2 + 2321^2 .

It is a cyclic number.

It is not a de Polignac number, because 55315397 - 2¹² = 55311301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55315397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55315307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27657698 + 27657699.

It is an arithmetic number, because the mean of its divisors is an integer number (27657699).

Almost surely, 2^55315397 is an apocalyptic number.

It is an amenable number.

55315397 is a deficient number, since it is larger than the sum of its proper divisors (1).

55315397 is an equidigital number, since it uses as much as digits as its factorization.

55315397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70875, while the sum is 38.

The square root of 55315397 is about 7437.4321509510. The cubic root of 55315397 is about 381.0207941659.

The spelling of 55315397 in words is "fifty-five million, three hundred fifteen thousand, three hundred ninety-seven".