1219315831 has 2 divisors, whose sum is σ = 1219315832. Its totient is φ = 1219315830.

The previous prime is 1219315819. The next prime is 1219315849. The reversal of 1219315831 is 1385139121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1219315831 - 2⁷ = 1219315703 is a prime.

It is a super-2 number, since 2×1219315831² = 2973462191454441122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1219315631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609657915 + 609657916.

It is an arithmetic number, because the mean of its divisors is an integer number (609657916).

Almost surely, 2^1219315831 is an apocalyptic number.

1219315831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219315831 is an equidigital number, since it uses as much as digits as its factorization.

1219315831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 1219315831 is about 34918.7031689323. The cubic root of 1219315831 is about 1068.3299510186.

The spelling of 1219315831 in words is "one billion, two hundred nineteen million, three hundred fifteen thousand, eight hundred thirty-one".