1551230231 has 4 divisors (see below), whose sum is σ = 1551436200. Its totient is φ = 1551024264.

The previous prime is 1551230227. The next prime is 1551230237. The reversal of 1551230231 is 1320321551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1320321551 = 26783 ⋅49297.

It is a cyclic number.

It is not a de Polignac number, because 1551230231 - 2² = 1551230227 is a prime.

It is a super-2 number, since 2×1551230231² = 4812630459136626722, 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 = 1551230197 and 1551230206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551230237) 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, 91241 + ... + 106898.

It is an arithmetic number, because the mean of its divisors is an integer number (387859050).

Almost surely, 2^1551230231 is an apocalyptic number.

1551230231 is a deficient number, since it is larger than the sum of its proper divisors (205969).

1551230231 is an equidigital number, since it uses as much as digits as its factorization.

1551230231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205968.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1551230231 is about 39385.6602204406. The cubic root of 1551230231 is about 1157.6006268536.

Adding to 1551230231 its reverse (1320321551), we get a palindrome (2871551782).

The spelling of 1551230231 in words is "one billion, five hundred fifty-one million, two hundred thirty thousand, two hundred thirty-one".