1690930081 has 8 divisors (see below), whose sum is σ = 1740771944. Its totient is φ = 1641306240.

The previous prime is 1690930069. The next prime is 1690930097. The reversal of 1690930081 is 1800390961.

It can be written as a sum of positive squares in 4 ways, for example, as 139830625 + 1551099456 = 11825^2 + 39384^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1690930081 - 2¹⁹ = 1690405793 is a prime.

It is a super-2 number, since 2×1690930081² = 5718489077661333122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

1690930081 is a modest number, since divided by 30081 gives 16909 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 1690930081.

It is not an unprimeable number, because it can be changed into a prime (1690930001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38700 + ... + 69853.

It is an arithmetic number, because the mean of its divisors is an integer number (217596493).

Almost surely, 2^1690930081 is an apocalyptic number.

It is an amenable number.

1690930081 is a deficient number, since it is larger than the sum of its proper divisors (49841863).

1690930081 is a wasteful number, since it uses less digits than its factorization.

1690930081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109011.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 1690930081 is about 41120.9202353255. The cubic root of 1690930081 is about 1191.3568970004.

The spelling of 1690930081 in words is "one billion, six hundred ninety million, nine hundred thirty thousand, eighty-one".