1531212379 has 2 divisors, whose sum is σ = 1531212380. Its totient is φ = 1531212378.

The previous prime is 1531212349. The next prime is 1531212461. The reversal of 1531212379 is 9732121351.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1531212379 is a prime.

It is a super-2 number, since 2×1531212379² = 4689222699205679282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1531212349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765606189 + 765606190.

It is an arithmetic number, because the mean of its divisors is an integer number (765606190).

Almost surely, 2^1531212379 is an apocalyptic number.

1531212379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531212379 is an equidigital number, since it uses as much as digits as its factorization.

1531212379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 34.

The square root of 1531212379 is about 39130.7088997887. The cubic root of 1531212379 is about 1152.5996335238.

The spelling of 1531212379 in words is "one billion, five hundred thirty-one million, two hundred twelve thousand, three hundred seventy-nine".