161421315 has 32 divisors (see below), whose sum is σ = 282686976. Its totient is φ = 78005760.

The previous prime is 161421313. The next prime is 161421319. The reversal of 161421315 is 513124161.

It is a happy number.

It is not a de Polignac number, because 161421315 - 2¹ = 161421313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161421313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54154 + ... + 57056.

It is an arithmetic number, because the mean of its divisors is an integer number (8833968).

Almost surely, 2^161421315 is an apocalyptic number.

161421315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161421315 is a deficient number, since it is larger than the sum of its proper divisors (121265661).

161421315 is a wasteful number, since it uses less digits than its factorization.

161421315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259.

The product of its digits is 720, while the sum is 24.

The square root of 161421315 is about 12705.1688300471. The cubic root of 161421315 is about 544.4863043925.

Adding to 161421315 its reverse (513124161), we get a palindrome (674545476).

The spelling of 161421315 in words is "one hundred sixty-one million, four hundred twenty-one thousand, three hundred fifteen".