160399981 has 12 divisors (see below), whose sum is σ = 197564508. Its totient is φ = 129397632.

The previous prime is 160399979. The next prime is 160399991. The reversal of 160399981 is 189993061.

160399981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 62568100 + 97831881 = 7910^2 + 9891^2 .

It is not a de Polignac number, because 160399981 - 2¹ = 160399979 is a prime.

It is a super-2 number, since 2×160399981² = 51456307809600722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (160399991) 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, 95446 + ... + 97111.

It is an arithmetic number, because the mean of its divisors is an integer number (16463709).

Almost surely, 2^160399981 is an apocalyptic number.

It is an amenable number.

160399981 is a deficient number, since it is larger than the sum of its proper divisors (37164527).

160399981 is a wasteful number, since it uses less digits than its factorization.

160399981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192588 (or 192581 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 160399981 is about 12664.9114090861. The cubic root of 160399981 is about 543.3355283220.

The spelling of 160399981 in words is "one hundred sixty million, three hundred ninety-nine thousand, nine hundred eighty-one".