55617261 has 16 divisors (see below), whose sum is σ = 84860544. Its totient is φ = 31739904.

The previous prime is 55617259. The next prime is 55617277. The reversal of 55617261 is 16271655.

It is not a de Polignac number, because 55617261 - 2¹ = 55617259 is a prime.

It is a super-2 number, since 2×55617261² = 6186559442284242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55617241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23065 + ... + 25361.

It is an arithmetic number, because the mean of its divisors is an integer number (5303784).

Almost surely, 2^55617261 is an apocalyptic number.

It is an amenable number.

55617261 is a deficient number, since it is larger than the sum of its proper divisors (29243283).

55617261 is a wasteful number, since it uses less digits than its factorization.

55617261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3460.

The product of its digits is 12600, while the sum is 33.

The square root of 55617261 is about 7457.6981033024. The cubic root of 55617261 is about 381.7126321160.

The spelling of 55617261 in words is "fifty-five million, six hundred seventeen thousand, two hundred sixty-one".