1370831881 has 2 divisors, whose sum is σ = 1370831882. Its totient is φ = 1370831880.

The previous prime is 1370831879. The next prime is 1370831911. The reversal of 1370831881 is 1881380731.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 896463481 + 474368400 = 29941^2 + 21780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1370831881 - 2¹ = 1370831879 is a prime.

It is a super-2 number, since 2×1370831881² = 3758360091931996322, which contains 22 as substring.

Together with 1370831879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1370831831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685415940 + 685415941.

It is an arithmetic number, because the mean of its divisors is an integer number (685415941).

Almost surely, 2^1370831881 is an apocalyptic number.

It is an amenable number.

1370831881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1370831881 is an equidigital number, since it uses as much as digits as its factorization.

1370831881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 1370831881 is about 37024.7468728687. The cubic root of 1370831881 is about 1110.8652942314.

The spelling of 1370831881 in words is "one billion, three hundred seventy million, eight hundred thirty-one thousand, eight hundred eighty-one".