1690097977 has 4 divisors (see below), whose sum is σ = 1691804416. Its totient is φ = 1688391540.

The previous prime is 1690097963. The next prime is 1690097999. The reversal of 1690097977 is 7797900961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7797900961 = 71 ⋅109829591.

It is a cyclic number.

It is not a de Polignac number, because 1690097977 - 2¹¹ = 1690095929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1690097677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851733 + ... + 853714.

It is an arithmetic number, because the mean of its divisors is an integer number (422951104).

Almost surely, 2^1690097977 is an apocalyptic number.

It is an amenable number.

1690097977 is a deficient number, since it is larger than the sum of its proper divisors (1706439).

1690097977 is an equidigital number, since it uses as much as digits as its factorization.

1690097977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706438.

The product of its (nonzero) digits is 1500282, while the sum is 55.

The square root of 1690097977 is about 41110.8012206038. The cubic root of 1690097977 is about 1191.1614433255.

The spelling of 1690097977 in words is "one billion, six hundred ninety million, ninety-seven thousand, nine hundred seventy-seven".