161899562 has 16 divisors (see below), whose sum is σ = 265522752. Its totient is φ = 73425120.

The previous prime is 161899559. The next prime is 161899571. The reversal of 161899562 is 265998161.

It is a happy number.

It is a super-2 number, since 2×161899562² = 52422936351583688, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2003 + ... + 18105.

It is an arithmetic number, because the mean of its divisors is an integer number (16595172).

Almost surely, 2^161899562 is an apocalyptic number.

161899562 is a deficient number, since it is larger than the sum of its proper divisors (103623190).

161899562 is a wasteful number, since it uses less digits than its factorization.

161899562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16573.

The product of its digits is 233280, while the sum is 47.

The square root of 161899562 is about 12723.9758723443. The cubic root of 161899562 is about 545.0234953258.

The spelling of 161899562 in words is "one hundred sixty-one million, eight hundred ninety-nine thousand, five hundred sixty-two".