1691492902 has 16 divisors (see below), whose sum is σ = 2773918224. Its totient is φ = 767188000.

The previous prime is 1691492821. The next prime is 1691492903. The reversal of 1691492902 is 2092941961.

It is a super-2 number, since 2×1691492902² = 5722296475032763208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691492903) 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, 73249 + ... + 93532.

It is an arithmetic number, because the mean of its divisors is an integer number (173369889).

Almost surely, 2^1691492902 is an apocalyptic number.

1691492902 is a deficient number, since it is larger than the sum of its proper divisors (1082425322).

1691492902 is a wasteful number, since it uses less digits than its factorization.

1691492902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167255.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 1691492902 is about 41127.7631533737. The cubic root of 1691492902 is about 1191.4890621931.

The spelling of 1691492902 in words is "one billion, six hundred ninety-one million, four hundred ninety-two thousand, nine hundred two".