161947450 has 120 divisors (see below), whose sum is σ = 375109920. Its totient is φ = 51861600.

The previous prime is 161947447. The next prime is 161947451. The reversal of 161947450 is 54749161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161947451) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2280915 + ... + 2280985.

It is an arithmetic number, because the mean of its divisors is an integer number (3125916).

Almost surely, 2^161947450 is an apocalyptic number.

161947450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161947450 is an abundant number, since it is smaller than the sum of its proper divisors (213162470).

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

161947450 is an equidigital number, since it uses as much as digits as its factorization.

161947450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 161947450 is about 12725.8575349561. The cubic root of 161947450 is about 545.0772272237.

The spelling of 161947450 in words is "one hundred sixty-one million, nine hundred forty-seven thousand, four hundred fifty".