1345981631 has 2 divisors, whose sum is σ = 1345981632. Its totient is φ = 1345981630.

The previous prime is 1345981583. The next prime is 1345981667. The reversal of 1345981631 is 1361895431.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1345981631 - 2²² = 1341787327 is a prime.

It is a super-2 number, since 2×1345981631² = 3623333101978840322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1345921631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672990815 + 672990816.

It is an arithmetic number, because the mean of its divisors is an integer number (672990816).

Almost surely, 2^1345981631 is an apocalyptic number.

1345981631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345981631 is an equidigital number, since it uses as much as digits as its factorization.

1345981631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 1345981631 is about 36687.6223132544. The cubic root of 1345981631 is about 1104.1117821488. Note that the first 3 decimals are identical.

The spelling of 1345981631 in words is "one billion, three hundred forty-five million, nine hundred eighty-one thousand, six hundred thirty-one".