1681902159 has 16 divisors (see below), whose sum is σ = 2611256832. Its totient is φ = 942952608.

The previous prime is 1681902149. The next prime is 1681902223. The reversal of 1681902159 is 9512091861.

It is not a de Polignac number, because 1681902159 - 2⁴ = 1681902143 is a prime.

It is a super-2 number, since 2×1681902159² = 5657589744897722562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1681902159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681902149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 754459 + ... + 756684.

It is an arithmetic number, because the mean of its divisors is an integer number (163203552).

Almost surely, 2^1681902159 is an apocalyptic number.

1681902159 is a deficient number, since it is larger than the sum of its proper divisors (929354673).

1681902159 is a wasteful number, since it uses less digits than its factorization.

1681902159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511206.

The product of its (nonzero) digits is 38880, while the sum is 42.

The square root of 1681902159 is about 41011.0004632903. Note that the first 3 decimals coincide. The cubic root of 1681902159 is about 1189.2328834172.

It can be divided in two parts, 1681 and 902159, that added together give a triangular number (903840 = T₁₃₄₄).

The spelling of 1681902159 in words is "one billion, six hundred eighty-one million, nine hundred two thousand, one hundred fifty-nine".