1051312231 has 4 divisors (see below), whose sum is σ = 1051377264. Its totient is φ = 1051247200.

The previous prime is 1051312211. The next prime is 1051312243. The reversal of 1051312231 is 1322131501.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1322131501 = 2647 ⋅499483.

It is a cyclic number.

It is not a de Polignac number, because 1051312231 - 2⁷ = 1051312103 is a prime.

It is a super-2 number, since 2×1051312231² = 2210514814100394722, 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 = 1051312199 and 1051312208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051312211) 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, 12591 + ... + 47551.

It is an arithmetic number, because the mean of its divisors is an integer number (262844316).

Almost surely, 2^1051312231 is an apocalyptic number.

1051312231 is a deficient number, since it is larger than the sum of its proper divisors (65033).

1051312231 is an equidigital number, since it uses as much as digits as its factorization.

1051312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65032.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1051312231 is about 32423.9453336573. The cubic root of 1051312231 is about 1016.8195922368.

Adding to 1051312231 its reverse (1322131501), we get a palindrome (2373443732).

The spelling of 1051312231 in words is "one billion, fifty-one million, three hundred twelve thousand, two hundred thirty-one".