1371992381 has 2 divisors, whose sum is σ = 1371992382. Its totient is φ = 1371992380.

The previous prime is 1371992371. The next prime is 1371992393. The reversal of 1371992381 is 1832991731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1300251481 + 71740900 = 36059^2 + 8470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1371992381 - 2⁶ = 1371992317 is a prime.

It is a super-2 number, since 2×1371992381² = 3764726187044098322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1371992311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685996190 + 685996191.

It is an arithmetic number, because the mean of its divisors is an integer number (685996191).

Almost surely, 2^1371992381 is an apocalyptic number.

It is an amenable number.

1371992381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1371992381 is an equidigital number, since it uses as much as digits as its factorization.

1371992381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 1371992381 is about 37040.4155079286. The cubic root of 1371992381 is about 1111.1786795017.

The spelling of 1371992381 in words is "one billion, three hundred seventy-one million, nine hundred ninety-two thousand, three hundred eighty-one".