161262250 has 16 divisors (see below), whose sum is σ = 301883400. Its totient is φ = 64504800.

The previous prime is 161262239. The next prime is 161262271. The reversal of 161262250 is 52262161.

161262250 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 61921161 + 99341089 = 7869^2 + 9967^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322275 + ... + 322774.

Almost surely, 2^161262250 is an apocalyptic number.

161262250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161262250 is a deficient number, since it is larger than the sum of its proper divisors (140621150).

161262250 is an equidigital number, since it uses as much as digits as its factorization.

161262250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645066 (or 645056 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 161262250 is about 12698.9074333188. The cubic root of 161262250 is about 544.3073995233.

The spelling of 161262250 in words is "one hundred sixty-one million, two hundred sixty-two thousand, two hundred fifty".