161523651 has 16 divisors (see below), whose sum is σ = 222117120. Its totient is φ = 104358240.

The previous prime is 161523623. The next prime is 161523683. The reversal of 161523651 is 156325161.

It is not a de Polignac number, because 161523651 - 2¹⁴ = 161507267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161523601) 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 15 ways as a sum of consecutive naturals, for example, 6141 + ... + 18993.

It is an arithmetic number, because the mean of its divisors is an integer number (13882320).

Almost surely, 2^161523651 is an apocalyptic number.

161523651 is a deficient number, since it is larger than the sum of its proper divisors (60593469).

161523651 is a wasteful number, since it uses less digits than its factorization.

161523651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12986.

The product of its digits is 5400, while the sum is 30.

The square root of 161523651 is about 12709.1955292221. The cubic root of 161523651 is about 544.6013424418.

The spelling of 161523651 in words is "one hundred sixty-one million, five hundred twenty-three thousand, six hundred fifty-one".