55551431 has 4 divisors (see below), whose sum is σ = 59824632. Its totient is φ = 51278232.

The previous prime is 55551409. The next prime is 55551437. The reversal of 55551431 is 13415555.

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 55551431 - 2¹⁴ = 55535047 is a prime.

It is a super-2 number, since 2×55551431² = 6171922972295522, 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 = 55551394 and 55551403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55551437) 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, 2136581 + ... + 2136606.

It is an arithmetic number, because the mean of its divisors is an integer number (14956158).

Almost surely, 2^55551431 is an apocalyptic number.

55551431 is a deficient number, since it is larger than the sum of its proper divisors (4273201).

55551431 is a wasteful number, since it uses less digits than its factorization.

55551431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4273200.

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

The square root of 55551431 is about 7453.2832362657. The cubic root of 55551431 is about 381.5619710758.

Adding to 55551431 its reverse (13415555), we get a palindrome (68966986).

The spelling of 55551431 in words is "fifty-five million, five hundred fifty-one thousand, four hundred thirty-one".