161409901 has 8 divisors (see below), whose sum is σ = 169105664. Its totient is φ = 153869760.

The previous prime is 161409893. The next prime is 161409943. The reversal of 161409901 is 109904161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161409901 - 2³ = 161409893 is a prime.

It is a super-2 number, since 2×161409901² = 52106312281659602, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161409301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36780 + ... + 40933.

It is an arithmetic number, because the mean of its divisors is an integer number (21138208).

Almost surely, 2^161409901 is an apocalyptic number.

It is an amenable number.

161409901 is a deficient number, since it is larger than the sum of its proper divisors (7695763).

161409901 is an equidigital number, since it uses as much as digits as its factorization.

161409901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77811.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 161409901 is about 12704.7196348444. The cubic root of 161409901 is about 544.4734706616.

The spelling of 161409901 in words is "one hundred sixty-one million, four hundred nine thousand, nine hundred one".