161951592 has 128 divisors (see below), whose sum is σ = 471744000. Its totient is φ = 45815040.

The previous prime is 161951567. The next prime is 161951593. The reversal of 161951592 is 295159161.

It is a self number, because there is not a number n which added to its sum of digits gives 161951592.

It is not an unprimeable number, because it can be changed into a prime (161951593) 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, 416134 + ... + 416522.

It is an arithmetic number, because the mean of its divisors is an integer number (3685500).

Almost surely, 2^161951592 is an apocalyptic number.

161951592 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161951592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235872000).

161951592 is an abundant number, since it is smaller than the sum of its proper divisors (309792408).

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

161951592 is a wasteful number, since it uses less digits than its factorization.

161951592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511 (or 507 counting only the distinct ones).

The product of its digits is 24300, while the sum is 39.

The square root of 161951592 is about 12726.0202734398. The cubic root of 161951592 is about 545.0818741850.

The spelling of 161951592 in words is "one hundred sixty-one million, nine hundred fifty-one thousand, five hundred ninety-two".