55431301531 has 4 divisors (see below), whose sum is σ = 57219408064. Its totient is φ = 53643195000.

The previous prime is 55431301511. The next prime is 55431301561. The reversal of 55431301531 is 13510313455.

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 55431301531 - 2⁹ = 55431301019 is a prime.

It is a super-2 number, since 2×55431301531² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1788106501 = 55431301531 / (5 + 5 + 4 + 3 + 1 + 3 + 0 + 1 + 5 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55431301493 and 55431301502.

It is not an unprimeable number, because it can be changed into a prime (55431301511) 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, 894053220 + ... + 894053281.

It is an arithmetic number, because the mean of its divisors is an integer number (14304852016).

Almost surely, 2^55431301531 is an apocalyptic number.

55431301531 is a deficient number, since it is larger than the sum of its proper divisors (1788106533).

55431301531 is a wasteful number, since it uses less digits than its factorization.

55431301531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788106532.

The product of its (nonzero) digits is 13500, while the sum is 31.

Adding to 55431301531 its reverse (13510313455), we get a palindrome (68941614986).

The spelling of 55431301531 in words is "fifty-five billion, four hundred thirty-one million, three hundred one thousand, five hundred thirty-one".