55981601 has 4 divisors (see below), whose sum is σ = 60287892. Its totient is φ = 51675312.

The previous prime is 55981579. The next prime is 55981631. The reversal of 55981601 is 10618955.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10618955 = 5 ⋅2123791.

It can be written as a sum of positive squares in 2 ways, for example, as 26832400 + 29149201 = 5180^2 + 5399^2 .

It is not a de Polignac number, because 55981601 - 2²² = 51787297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55981631) 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, 2153126 + ... + 2153151.

It is an arithmetic number, because the mean of its divisors is an integer number (15071973).

Almost surely, 2^55981601 is an apocalyptic number.

It is an amenable number.

55981601 is a deficient number, since it is larger than the sum of its proper divisors (4306291).

55981601 is a wasteful number, since it uses less digits than its factorization.

55981601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306290.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 55981601 is about 7482.0853376582. The cubic root of 55981601 is about 382.5443319400.

The spelling of 55981601 in words is "fifty-five million, nine hundred eighty-one thousand, six hundred one".