1690713581 has 2 divisors, whose sum is σ = 1690713582. Its totient is φ = 1690713580.

The previous prime is 1690713553. The next prime is 1690713587. The reversal of 1690713581 is 1853170961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1660562500 + 30151081 = 40750^2 + 5491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1690713581 is a prime.

It is a super-2 number, since 2×1690713581² = 5717024825955687122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1690713587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845356790 + 845356791.

It is an arithmetic number, because the mean of its divisors is an integer number (845356791).

Almost surely, 2^1690713581 is an apocalyptic number.

It is an amenable number.

1690713581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690713581 is an equidigital number, since it uses as much as digits as its factorization.

1690713581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 1690713581 is about 41118.2876710595. The cubic root of 1690713581 is about 1191.3060492884.

The spelling of 1690713581 in words is "one billion, six hundred ninety million, seven hundred thirteen thousand, five hundred eighty-one".