55545431 has 4 divisors (see below), whose sum is σ = 56593512. Its totient is φ = 54497352.

The previous prime is 55545421. The next prime is 55545433. The reversal of 55545431 is 13454555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13454555 = 5 ⋅2690911.

It is a cyclic number.

It is not a de Polignac number, because 55545431 - 2⁶ = 55545367 is a prime.

It is a super-2 number, since 2×55545431² = 6170589809951522, 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 (55545433) 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, 523961 + ... + 524066.

It is an arithmetic number, because the mean of its divisors is an integer number (14148378).

Almost surely, 2^55545431 is an apocalyptic number.

55545431 is a deficient number, since it is larger than the sum of its proper divisors (1048081).

55545431 is a wasteful number, since it uses less digits than its factorization.

55545431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048080.

The product of its digits is 30000, while the sum is 32.

The square root of 55545431 is about 7452.8807182190. The cubic root of 55545431 is about 381.5482333303.

Adding to 55545431 its reverse (13454555), we get a palindrome (68999986).

The spelling of 55545431 in words is "fifty-five million, five hundred forty-five thousand, four hundred thirty-one".