1251722160 has 420 divisors, whose sum is σ = 4762052352. Its totient is φ = 305690112.

The previous prime is 1251722141. The next prime is 1251722209. The reversal of 1251722160 is 612271521.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 9856017 + ... + 9856143.

Almost surely, 2^1251722160 is an apocalyptic number.

1251722160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251722160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2381026176).

1251722160 is an abundant number, since it is smaller than the sum of its proper divisors (3510330192).

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

1251722160 is a wasteful number, since it uses less digits than its factorization.

1251722160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 1251722160 is about 35379.6856967385. The cubic root of 1251722160 is about 1077.7118221665.

Adding to 1251722160 its reverse (612271521), we get a palindrome (1863993681).

The spelling of 1251722160 in words is "one billion, two hundred fifty-one million, seven hundred twenty-two thousand, one hundred sixty".