55129657 has 12 divisors (see below), whose sum is σ = 64163988. Its totient is φ = 47168000.

The previous prime is 55129631. The next prime is 55129681. The reversal of 55129657 is 75692155.

55129657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 30735936 + 24393721 = 5544^2 + 4939^2 .

It is not a de Polignac number, because 55129657 - 2¹¹ = 55127609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55129057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11344 + ... + 15457.

It is an arithmetic number, because the mean of its divisors is an integer number (5346999).

Almost surely, 2^55129657 is an apocalyptic number.

It is an amenable number.

55129657 is a deficient number, since it is larger than the sum of its proper divisors (9034331).

55129657 is a wasteful number, since it uses less digits than its factorization.

55129657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26840 (or 26829 counting only the distinct ones).

The product of its digits is 94500, while the sum is 40.

The square root of 55129657 is about 7424.9348145287. The cubic root of 55129657 is about 380.5938475622.

The spelling of 55129657 in words is "fifty-five million, one hundred twenty-nine thousand, six hundred fifty-seven".