1690885061 has 4 divisors (see below), whose sum is σ = 1692310752. Its totient is φ = 1689459372.

The previous prime is 1690885051. The next prime is 1690885117. The reversal of 1690885061 is 1605880961.

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: 1605880961 = 29989 ⋅53549.

It is a cyclic number.

It is not a de Polignac number, because 1690885061 - 2¹⁰ = 1690884037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690885051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 711065 + ... + 713438.

It is an arithmetic number, because the mean of its divisors is an integer number (423077688).

Almost surely, 2^1690885061 is an apocalyptic number.

It is an amenable number.

1690885061 is a deficient number, since it is larger than the sum of its proper divisors (1425691).

1690885061 is a wasteful number, since it uses less digits than its factorization.

1690885061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425690.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 1690885061 is about 41120.3728217535. The cubic root of 1690885061 is about 1191.3463238521.

The spelling of 1690885061 in words is "one billion, six hundred ninety million, eight hundred eighty-five thousand, sixty-one".