161631250 has 48 divisors (see below), whose sum is σ = 330728832. Its totient is φ = 58750000.

The previous prime is 161631247. The next prime is 161631251. The reversal of 161631250 is 52136161.

It is a super-2 number, since 2×161631250² = 52249321953125000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (161631251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67575 + ... + 69925.

It is an arithmetic number, because the mean of its divisors is an integer number (6890184).

Almost surely, 2^161631250 is an apocalyptic number.

161631250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161631250 is an abundant number, since it is smaller than the sum of its proper divisors (169097582).

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

161631250 is an equidigital number, since it uses as much as digits as its factorization.

161631250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389 (or 2369 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 161631250 is about 12713.4279405674. The cubic root of 161631250 is about 544.7222443499.

The spelling of 161631250 in words is "one hundred sixty-one million, six hundred thirty-one thousand, two hundred fifty".