161956098 has 64 divisors (see below), whose sum is σ = 370928640. Its totient is φ = 53012880.

The previous prime is 161956079. The next prime is 161956111. The reversal of 161956098 is 890659161.

It is a super-3 number, since 3×161956098³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 266511 + ... + 267117.

It is an arithmetic number, because the mean of its divisors is an integer number (5795760).

Almost surely, 2^161956098 is an apocalyptic number.

161956098 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161956098, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185464320).

161956098 is an abundant number, since it is smaller than the sum of its proper divisors (208972542).

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

161956098 is an frugal number, since it uses more digits than its factorization.

161956098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 161956098 is about 12726.1973110588. The cubic root of 161956098 is about 545.0869294325.

The spelling of 161956098 in words is "one hundred sixty-one million, nine hundred fifty-six thousand, ninety-eight".