1606405131 has 6 divisors (see below), whose sum is σ = 2320362980. Its totient is φ = 1070936748.

The previous prime is 1606405121. The next prime is 1606405139. The reversal of 1606405131 is 1315046061.

1606405131 is a `hidden beast` number, since 1 + 6 + 0 + 640 + 5 + 13 + 1 = 666.

It is not a de Polignac number, because 1606405131 - 2⁹ = 1606404619 is a prime.

It is a super-2 number, since 2×1606405131² = 5161074889806254322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1606405095 and 1606405104.

It is not an unprimeable number, because it can be changed into a prime (1606405139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 89244721 + ... + 89244738.

Almost surely, 2^1606405131 is an apocalyptic number.

1606405131 is a deficient number, since it is larger than the sum of its proper divisors (713957849).

1606405131 is a wasteful number, since it uses less digits than its factorization.

1606405131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178489465 (or 178489462 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1606405131 is about 40079.9841691586. The cubic root of 1606405131 is about 1171.1657436560.

The spelling of 1606405131 in words is "one billion, six hundred six million, four hundred five thousand, one hundred thirty-one".