161287401 has 16 divisors (see below), whose sum is σ = 234812160. Its totient is φ = 97661520.

The previous prime is 161287397. The next prime is 161287421. The reversal of 161287401 is 104782161.

161287401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161287401 - 2² = 161287397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161287421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70786 + ... + 73028.

It is an arithmetic number, because the mean of its divisors is an integer number (14675760).

Almost surely, 2^161287401 is an apocalyptic number.

161287401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161287401 is a deficient number, since it is larger than the sum of its proper divisors (73524759).

161287401 is a wasteful number, since it uses less digits than its factorization.

161287401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4436.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 161287401 is about 12699.8976767531. The cubic root of 161287401 is about 544.3356953866.

The spelling of 161287401 in words is "one hundred sixty-one million, two hundred eighty-seven thousand, four hundred one".