55540431 has 8 divisors (see below), whose sum is σ = 82282160. Its totient is φ = 37026936.

The previous prime is 55540427. The next prime is 55540451. The reversal of 55540431 is 13404555.

It is not a de Polignac number, because 55540431 - 2² = 55540427 is a prime.

It is a super-2 number, since 2×55540431² = 6169478951331522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2057053 = 55540431 / (5 + 5 + 5 + 4 + 0 + 4 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55540395 and 55540404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55540451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1028500 + ... + 1028553.

It is an arithmetic number, because the mean of its divisors is an integer number (10285270).

Almost surely, 2^55540431 is an apocalyptic number.

55540431 is a deficient number, since it is larger than the sum of its proper divisors (26741729).

55540431 is a wasteful number, since it uses less digits than its factorization.

55540431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057062 (or 2057056 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 55540431 is about 7452.5452699061. The cubic root of 55540431 is about 381.5367844534.

Adding to 55540431 its reverse (13404555), we get a palindrome (68944986).

The spelling of 55540431 in words is "fifty-five million, five hundred forty thousand, four hundred thirty-one".