161315401 has 9 divisors (see below), whose sum is σ = 174857781. Its totient is φ = 148754112.

The previous prime is 161315347. The next prime is 161315461. The reversal of 161315401 is 104513161.

The square root of 161315401 is 12701.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 3059001 + 158256400 = 1749^2 + 12580^2 .

It is a de Polignac number, because none of the positive numbers 2^k-161315401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161315461) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 164625 + ... + 165601.

Almost surely, 2^161315401 is an apocalyptic number.

161315401 is the 12701-st square number.

161315401 is the 6351-st centered octagonal number.

It is an amenable number.

161315401 is a deficient number, since it is larger than the sum of its proper divisors (13542380).

161315401 is an frugal number, since it uses more digits than its factorization.

161315401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The cubic root of 161315401 is about 544.3671930268.

Adding to 161315401 its reverse (104513161), we get a palindrome (265828562).

The spelling of 161315401 in words is "one hundred sixty-one million, three hundred fifteen thousand, four hundred one".