1381299631 has 2 divisors, whose sum is σ = 1381299632. Its totient is φ = 1381299630.

The previous prime is 1381299629. The next prime is 1381299641. The reversal of 1381299631 is 1369921831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1381299631 - 2¹ = 1381299629 is a prime.

It is a super-2 number, since 2×1381299631² = 3815977341201472322, which contains 22 as substring.

Together with 1381299629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381299641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690649815 + 690649816.

It is an arithmetic number, because the mean of its divisors is an integer number (690649816).

Almost surely, 2^1381299631 is an apocalyptic number.

1381299631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381299631 is an equidigital number, since it uses as much as digits as its factorization.

1381299631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 43.

The square root of 1381299631 is about 37165.8395707671. The cubic root of 1381299631 is about 1113.6856709805.

The spelling of 1381299631 in words is "one billion, three hundred eighty-one million, two hundred ninety-nine thousand, six hundred thirty-one".