1390991573 has 2 divisors, whose sum is σ = 1390991574. Its totient is φ = 1390991572.

The previous prime is 1390991521. The next prime is 1390991617. The reversal of 1390991573 is 3751990931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1263233764 + 127757809 = 35542^2 + 11303^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390991573 - 2¹⁴ = 1390975189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1390991773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695495786 + 695495787.

It is an arithmetic number, because the mean of its divisors is an integer number (695495787).

Almost surely, 2^1390991573 is an apocalyptic number.

It is an amenable number.

1390991573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390991573 is an equidigital number, since it uses as much as digits as its factorization.

1390991573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 229635, while the sum is 47.

The square root of 1390991573 is about 37295.9994235307. Note that the first 3 decimals coincide. The cubic root of 1390991573 is about 1116.2843419840.

The spelling of 1390991573 in words is "one billion, three hundred ninety million, nine hundred ninety-one thousand, five hundred seventy-three".