55515431 has 8 divisors (see below), whose sum is σ = 56183760. Its totient is φ = 54850432.

The previous prime is 55515419. The next prime is 55515437. The reversal of 55515431 is 13451555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55515431 is a prime.

It is a super-2 number, since 2×55515431² = 6163926158231522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55515394 and 55515403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55515437) 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, 49505 + ... + 50613.

It is an arithmetic number, because the mean of its divisors is an integer number (7022970).

Almost surely, 2^55515431 is an apocalyptic number.

55515431 is a deficient number, since it is larger than the sum of its proper divisors (668329).

55515431 is a wasteful number, since it uses less digits than its factorization.

55515431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665.

The product of its digits is 7500, while the sum is 29.

The square root of 55515431 is about 7450.8678018067. The cubic root of 55515431 is about 381.4795297595.

Adding to 55515431 its reverse (13451555), we get a palindrome (68966986).

The spelling of 55515431 in words is "fifty-five million, five hundred fifteen thousand, four hundred thirty-one".