1312021231 has 8 divisors (see below), whose sum is σ = 1383897600. Its totient is φ = 1240427160.

The previous prime is 1312021229. The next prime is 1312021241. The reversal of 1312021231 is 1321202131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1312021231 - 2¹ = 1312021229 is a prime.

It is a super-2 number, since 2×1312021231² = 3442799421189510722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312021241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60991 + ... + 79648.

It is an arithmetic number, because the mean of its divisors is an integer number (172987200).

Almost surely, 2^1312021231 is an apocalyptic number.

1312021231 is a deficient number, since it is larger than the sum of its proper divisors (71876369).

1312021231 is a wasteful number, since it uses less digits than its factorization.

1312021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141149.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1312021231 is about 36221.8336228303. The cubic root of 1312021231 is about 1094.7466400194.

Adding to 1312021231 its reverse (1321202131), we get a palindrome (2633223362).

Subtracting 1312021231 from its reverse (1321202131), we obtain a square (9180900 = 3030²).

The spelling of 1312021231 in words is "one billion, three hundred twelve million, twenty-one thousand, two hundred thirty-one".