551020031 has 4 divisors (see below), whose sum is σ = 583432992. Its totient is φ = 518607072.

The previous prime is 551019991. The next prime is 551020037. The reversal of 551020031 is 130020155.

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 551020031 - 2⁶ = 551019967 is a prime.

It is a super-2 number, since 2×551020031² = 607246149126481922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 32412943 = 551020031 / (5 + 5 + 1 + 0 + 2 + 0 + 0 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 551019991 and 551020009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551020037) 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, 16206455 + ... + 16206488.

It is an arithmetic number, because the mean of its divisors is an integer number (145858248).

Almost surely, 2^551020031 is an apocalyptic number.

551020031 is a deficient number, since it is larger than the sum of its proper divisors (32412961).

551020031 is a wasteful number, since it uses less digits than its factorization.

551020031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32412960.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 551020031 is about 23473.8158593783. The cubic root of 551020031 is about 819.8274627073.

Adding to 551020031 its reverse (130020155), we get a palindrome (681040186).

The spelling of 551020031 in words is "five hundred fifty-one million, twenty thousand, thirty-one".