55971861 has 16 divisors (see below), whose sum is σ = 83615808. Its totient is φ = 33004800.

The previous prime is 55971859. The next prime is 55971863. The reversal of 55971861 is 16817955.

It is an interprime number because it is at equal distance from previous prime (55971859) and next prime (55971863).

It is not a de Polignac number, because 55971861 - 2¹ = 55971859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55971863) 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, 21700 + ... + 24141.

It is an arithmetic number, because the mean of its divisors is an integer number (5225988).

Almost surely, 2^55971861 is an apocalyptic number.

It is an amenable number.

55971861 is a deficient number, since it is larger than the sum of its proper divisors (27643947).

55971861 is a wasteful number, since it uses less digits than its factorization.

55971861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45892.

The product of its digits is 75600, while the sum is 42.

The square root of 55971861 is about 7481.4344212858. The cubic root of 55971861 is about 382.5221449010.

The spelling of 55971861 in words is "fifty-five million, nine hundred seventy-one thousand, eight hundred sixty-one".