161572542 has 16 divisors (see below), whose sum is σ = 340152960. Its totient is φ = 51022872.

The previous prime is 161572517. The next prime is 161572547. The reversal of 161572542 is 245275161.

It is a super-2 number, since 2×161572542² = 52211372656683528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161572547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 708538 + ... + 708765.

It is an arithmetic number, because the mean of its divisors is an integer number (21259560).

Almost surely, 2^161572542 is an apocalyptic number.

161572542 is an abundant number, since it is smaller than the sum of its proper divisors (178580418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161572542 is a wasteful number, since it uses less digits than its factorization.

161572542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417327.

The product of its digits is 16800, while the sum is 33.

The square root of 161572542 is about 12711.1188335252. The cubic root of 161572542 is about 544.6562846914.

The spelling of 161572542 in words is "one hundred sixty-one million, five hundred seventy-two thousand, five hundred forty-two".