161072001 has 24 divisors (see below), whose sum is σ = 241672704. Its totient is φ = 103265280.

The previous prime is 161071969. The next prime is 161072033. The reversal of 161072001 is 100270161.

It is an interprime number because it is at equal distance from previous prime (161071969) and next prime (161072033).

It is not a de Polignac number, because 161072001 - 2⁵ = 161071969 is a prime.

It is a super-2 number, since 2×161072001² = 51888379012288002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161072071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44865 + ... + 48321.

It is an arithmetic number, because the mean of its divisors is an integer number (10069696).

Almost surely, 2^161072001 is an apocalyptic number.

It is an amenable number.

161072001 is a deficient number, since it is larger than the sum of its proper divisors (80600703).

161072001 is a wasteful number, since it uses less digits than its factorization.

161072001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661 (or 3658 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 161072001 is about 12691.4144601774. The cubic root of 161072001 is about 544.0932665655.

The spelling of 161072001 in words is "one hundred sixty-one million, seventy-two thousand, one".