1690674977 has 2 divisors, whose sum is σ = 1690674978. Its totient is φ = 1690674976.

The previous prime is 1690674943. The next prime is 1690674991. The reversal of 1690674977 is 7794760961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1124663296 + 566011681 = 33536^2 + 23791^2 .

It is a cyclic number.

It is not a de Polignac number, because 1690674977 - 2⁸ = 1690674721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1690674877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845337488 + 845337489.

It is an arithmetic number, because the mean of its divisors is an integer number (845337489).

Almost surely, 2^1690674977 is an apocalyptic number.

It is an amenable number.

1690674977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690674977 is an equidigital number, since it uses as much as digits as its factorization.

1690674977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000752, while the sum is 56.

The square root of 1690674977 is about 41117.8182422171. The cubic root of 1690674977 is about 1191.2969822039.

The spelling of 1690674977 in words is "one billion, six hundred ninety million, six hundred seventy-four thousand, nine hundred seventy-seven".