1390142081 has 2 divisors, whose sum is σ = 1390142082. Its totient is φ = 1390142080.

The previous prime is 1390142069. The next prime is 1390142093. The reversal of 1390142081 is 1802410931.

It is a balanced prime because it is at equal distance from previous prime (1390142069) and next prime (1390142093).

It can be written as a sum of positive squares in only one way, i.e., 1382352400 + 7789681 = 37180^2 + 2791^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1390142081 is a prime.

It is a super-2 number, since 2×1390142081² = 3864990010734021122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1390142981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695071040 + 695071041.

It is an arithmetic number, because the mean of its divisors is an integer number (695071041).

Almost surely, 2^1390142081 is an apocalyptic number.

It is an amenable number.

1390142081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390142081 is an equidigital number, since it uses as much as digits as its factorization.

1390142081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1390142081 is about 37284.6091705411. The cubic root of 1390142081 is about 1116.0570538292.

The spelling of 1390142081 in words is "one billion, three hundred ninety million, one hundred forty-two thousand, eighty-one".