2081690154 has 24 divisors (see below), whose sum is σ = 4775642820. Its totient is φ = 653079168.

The previous prime is 2081690011. The next prime is 2081690159. The reversal of 2081690154 is 4510961802.

It can be written as a sum of positive squares in 2 ways, for example, as 2077992225 + 3697929 = 45585^2 + 1923^2 .

It is not an unprimeable number, because it can be changed into a prime (2081690159) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3401149 + ... + 3401760.

Almost surely, 2^2081690154 is an apocalyptic number.

2081690154 is an abundant number, since it is smaller than the sum of its proper divisors (2693952666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2081690154 is a wasteful number, since it uses less digits than its factorization.

2081690154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6802934 (or 6802931 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 2081690154 is about 45625.5427803330. The cubic root of 2081690154 is about 1276.8465166512.

The spelling of 2081690154 in words is "two billion, eighty-one million, six hundred ninety thousand, one hundred fifty-four".