55642519 has 4 divisors (see below), whose sum is σ = 55695640. Its totient is φ = 55589400.

The previous prime is 55642511. The next prime is 55642523. The reversal of 55642519 is 91524655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91524655 = 5 ⋅18304931.

It is a cyclic number.

It is not a de Polignac number, because 55642519 - 2³ = 55642511 is a prime.

It is a super-2 number, since 2×55642519² = 6192179841330722, 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 (55642511) 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, 24957 + ... + 27094.

It is an arithmetic number, because the mean of its divisors is an integer number (13923910).

Almost surely, 2^55642519 is an apocalyptic number.

55642519 is a deficient number, since it is larger than the sum of its proper divisors (53121).

55642519 is a wasteful number, since it uses less digits than its factorization.

55642519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53120.

The product of its digits is 54000, while the sum is 37.

The square root of 55642519 is about 7459.3913290563. The cubic root of 55642519 is about 381.7704069768.

The spelling of 55642519 in words is "fifty-five million, six hundred forty-two thousand, five hundred nineteen".