55431511 has 4 divisors (see below), whose sum is σ = 55673800. Its totient is φ = 55189224.

The previous prime is 55431479. The next prime is 55431539. The reversal of 55431511 is 11513455.

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 55431511 - 2⁵ = 55431479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55431011) 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, 120801 + ... + 121258.

It is an arithmetic number, because the mean of its divisors is an integer number (13918450).

Almost surely, 2^55431511 is an apocalyptic number.

55431511 is a deficient number, since it is larger than the sum of its proper divisors (242289).

55431511 is a wasteful number, since it uses less digits than its factorization.

55431511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242288.

The product of its digits is 1500, while the sum is 25.

The square root of 55431511 is about 7445.2341131760. The cubic root of 55431511 is about 381.2872114176.

Adding to 55431511 its reverse (11513455), we get a palindrome (66944966).

The spelling of 55431511 in words is "fifty-five million, four hundred thirty-one thousand, five hundred eleven".