55711861 has 4 divisors (see below), whose sum is σ = 55750912. Its totient is φ = 55672812.

The previous prime is 55711847. The next prime is 55711879. The reversal of 55711861 is 16811755.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55711861 - 2¹⁵ = 55679093 is a prime.

It is a super-2 number, since 2×55711861² = 6207622912166642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55711801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17301 + ... + 20266.

It is an arithmetic number, because the mean of its divisors is an integer number (13937728).

Almost surely, 2^55711861 is an apocalyptic number.

It is an amenable number.

55711861 is a deficient number, since it is larger than the sum of its proper divisors (39051).

55711861 is a wasteful number, since it uses less digits than its factorization.

55711861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39050.

The product of its digits is 8400, while the sum is 34.

The square root of 55711861 is about 7464.0378482427. The cubic root of 55711861 is about 381.9289292414.

The spelling of 55711861 in words is "fifty-five million, seven hundred eleven thousand, eight hundred sixty-one".