55137697 has 2 divisors, whose sum is σ = 55137698. Its totient is φ = 55137696.

The previous prime is 55137679. The next prime is 55137701. The reversal of 55137697 is 79673155.

Together with previous prime (55137679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32251041 + 22886656 = 5679^2 + 4784^2 .

It is a cyclic number.

It is not a de Polignac number, because 55137697 - 2⁷ = 55137569 is a prime.

It is not a weakly prime, because it can be changed into another prime (55137637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27568848 + 27568849.

It is an arithmetic number, because the mean of its divisors is an integer number (27568849).

Almost surely, 2^55137697 is an apocalyptic number.

It is an amenable number.

55137697 is a deficient number, since it is larger than the sum of its proper divisors (1).

55137697 is an equidigital number, since it uses as much as digits as its factorization.

55137697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198450, while the sum is 43.

The square root of 55137697 is about 7425.4762136849. The cubic root of 55137697 is about 380.6123483472.

The spelling of 55137697 in words is "fifty-five million, one hundred thirty-seven thousand, six hundred ninety-seven".