161226250 has 20 divisors (see below), whose sum is σ = 302204826. Its totient is φ = 64490000.

The previous prime is 161226203. The next prime is 161226271. The reversal of 161226250 is 52622161.

It can be written as a sum of positive squares in 5 ways, for example, as 33558849 + 127667401 = 5793^2 + 11299^2 .

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 9 ways as a sum of consecutive naturals, for example, 63241 + ... + 65740.

Almost surely, 2^161226250 is an apocalyptic number.

161226250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161226250 is a deficient number, since it is larger than the sum of its proper divisors (140978576).

161226250 is an equidigital number, since it uses as much as digits as its factorization.

161226250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129003 (or 128988 counting only the distinct ones).

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

The square root of 161226250 is about 12697.4899094270. The cubic root of 161226250 is about 544.2668929888.

The spelling of 161226250 in words is "one hundred sixty-one million, two hundred twenty-six thousand, two hundred fifty".