161261432 has 8 divisors (see below), whose sum is σ = 302365200. Its totient is φ = 80630712.

The previous prime is 161261423. The next prime is 161261437. The reversal of 161261432 is 234162161.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161261437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10078832 + ... + 10078847.

It is an arithmetic number, because the mean of its divisors is an integer number (37795650).

Almost surely, 2^161261432 is an apocalyptic number.

It is an amenable number.

161261432 is a deficient number, since it is larger than the sum of its proper divisors (141103768).

161261432 is a wasteful number, since it uses less digits than its factorization.

161261432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20157685 (or 20157681 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 161261432 is about 12698.8752257828. The cubic root of 161261432 is about 544.3064791918.

The spelling of 161261432 in words is "one hundred sixty-one million, two hundred sixty-one thousand, four hundred thirty-two".