161415621 has 12 divisors (see below), whose sum is σ = 245427520. Its totient is φ = 101946600.

The previous prime is 161415533. The next prime is 161415637. The reversal of 161415621 is 126514161.

161415621 is a `hidden beast` number, since 1 + 61 + 41 + 562 + 1 = 666.

It is not a de Polignac number, because 161415621 - 2²¹ = 159318469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161415691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 471805 + ... + 472146.

Almost surely, 2^161415621 is an apocalyptic number.

It is an amenable number.

161415621 is a deficient number, since it is larger than the sum of its proper divisors (84011899).

161415621 is a wasteful number, since it uses less digits than its factorization.

161415621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943976 (or 943973 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 161415621 is about 12704.9447460428. The cubic root of 161415621 is about 544.4799022197.

Adding to 161415621 its reverse (126514161), we get a palindrome (287929782).

The spelling of 161415621 in words is "one hundred sixty-one million, four hundred fifteen thousand, six hundred twenty-one".