55851881 has 8 divisors (see below), whose sum is σ = 57317064. Its totient is φ = 54391680.

The previous prime is 55851871. The next prime is 55851893. The reversal of 55851881 is 18815855.

55851881 = 5284² + 5285².

It can be written as a sum of positive squares in 4 ways, for example, as 5569600 + 50282281 = 2360^2 + 7091^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55851881 - 2¹⁰ = 55850857 is a prime.

It is a super-2 number, since 2×55851881² = 6238865222476322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55851821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34175 + ... + 35771.

It is an arithmetic number, because the mean of its divisors is an integer number (7164633).

Almost surely, 2^55851881 is an apocalyptic number.

55851881 is the 5285-th centered square number.

It is an amenable number.

55851881 is a deficient number, since it is larger than the sum of its proper divisors (1465183).

55851881 is a wasteful number, since it uses less digits than its factorization.

55851881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2491.

The product of its digits is 64000, while the sum is 41.

The square root of 55851881 is about 7473.4116038125. The cubic root of 55851881 is about 382.2486274680.

The spelling of 55851881 in words is "fifty-five million, eight hundred fifty-one thousand, eight hundred eighty-one".