1690335797 has 2 divisors, whose sum is σ = 1690335798. Its totient is φ = 1690335796.

The previous prime is 1690335767. The next prime is 1690335811. The reversal of 1690335797 is 7975330961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1471029316 + 219306481 = 38354^2 + 14809^2 .

It is a cyclic number.

It is not a de Polignac number, because 1690335797 - 2⁶ = 1690335733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1690335727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845167898 + 845167899.

It is an arithmetic number, because the mean of its divisors is an integer number (845167899).

Almost surely, 2^1690335797 is an apocalyptic number.

It is an amenable number.

1690335797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690335797 is an equidigital number, since it uses as much as digits as its factorization.

1690335797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1071630, while the sum is 50.

The square root of 1690335797 is about 41113.6935460681. The cubic root of 1690335797 is about 1191.2173116306.

The spelling of 1690335797 in words is "one billion, six hundred ninety million, three hundred thirty-five thousand, seven hundred ninety-seven".