5551231531 has 4 divisors (see below), whose sum is σ = 5686627464. Its totient is φ = 5415835600.

The previous prime is 5551231529. The next prime is 5551231541. The reversal of 5551231531 is 1351321555.

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 5551231531 - 2¹ = 5551231529 is a prime.

It is a super-2 number, since 2×5551231531² = 61632343021537207922, 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 = 5551231493 and 5551231502.

It is not an unprimeable number, because it can be changed into a prime (5551231541) 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, 67697905 + ... + 67697986.

It is an arithmetic number, because the mean of its divisors is an integer number (1421656866).

Almost surely, 2^5551231531 is an apocalyptic number.

5551231531 is a deficient number, since it is larger than the sum of its proper divisors (135395933).

5551231531 is a wasteful number, since it uses less digits than its factorization.

5551231531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135395932.

The product of its digits is 11250, while the sum is 31.

The square root of 5551231531 is about 74506.5871651628. The cubic root of 5551231531 is about 1770.6379998657.

The spelling of 5551231531 in words is "five billion, five hundred fifty-one million, two hundred thirty-one thousand, five hundred thirty-one".