55402081 has 16 divisors (see below), whose sum is σ = 67599360. Its totient is φ = 44346960.

The previous prime is 55402079. The next prime is 55402097. The reversal of 55402081 is 18020455.

It is not a de Polignac number, because 55402081 - 2¹ = 55402079 is a prime.

It is a super-2 number, since 2×55402081² = 6138781158261122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55402381) 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, 6510 + ... + 12376.

It is an arithmetic number, because the mean of its divisors is an integer number (4224960).

Almost surely, 2^55402081 is an apocalyptic number.

It is an amenable number.

55402081 is a deficient number, since it is larger than the sum of its proper divisors (12197279).

55402081 is a wasteful number, since it uses less digits than its factorization.

55402081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5964.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 55402081 is about 7443.2574186306. The cubic root of 55402081 is about 381.2197211105.

The spelling of 55402081 in words is "fifty-five million, four hundred two thousand, eighty-one".