55422431 has 4 divisors (see below), whose sum is σ = 58682592. Its totient is φ = 52162272.

The previous prime is 55422407. The next prime is 55422443. The reversal of 55422431 is 13422455.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55422431 - 2²² = 51228127 is a prime.

It is a super-2 number, since 2×55422431² = 6143291715899522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55422431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55422491) 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, 1630055 + ... + 1630088.

It is an arithmetic number, because the mean of its divisors is an integer number (14670648).

Almost surely, 2^55422431 is an apocalyptic number.

55422431 is a deficient number, since it is larger than the sum of its proper divisors (3260161).

55422431 is a wasteful number, since it uses less digits than its factorization.

55422431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3260160.

The product of its digits is 4800, while the sum is 26.

The square root of 55422431 is about 7444.6243021391. The cubic root of 55422431 is about 381.2663912688.

Adding to 55422431 its reverse (13422455), we get a palindrome (68844886).

The spelling of 55422431 in words is "fifty-five million, four hundred twenty-two thousand, four hundred thirty-one".