55415881 has 2 divisors, whose sum is σ = 55415882. Its totient is φ = 55415880.

The previous prime is 55415873. The next prime is 55415909. The reversal of 55415881 is 18851455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51840000 + 3575881 = 7200^2 + 1891^2 .

It is a cyclic number.

It is not a de Polignac number, because 55415881 - 2³ = 55415873 is a prime.

It is a super-2 number, since 2×55415881² = 6141839734012322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55415881.

It is not a weakly prime, because it can be changed into another prime (55415821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27707940 + 27707941.

It is an arithmetic number, because the mean of its divisors is an integer number (27707941).

Almost surely, 2^55415881 is an apocalyptic number.

It is an amenable number.

55415881 is a deficient number, since it is larger than the sum of its proper divisors (1).

55415881 is an equidigital number, since it uses as much as digits as its factorization.

55415881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32000, while the sum is 37.

The square root of 55415881 is about 7444.1843743959. The cubic root of 55415881 is about 381.2513709169.

The spelling of 55415881 in words is "fifty-five million, four hundred fifteen thousand, eight hundred eighty-one".