1251222620 has 48 divisors (see below), whose sum is σ = 2720487168. Its totient is φ = 482887680.

The previous prime is 1251222607. The next prime is 1251222653. The reversal of 1251222620 is 262221521.

1251222620 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216002 + ... + 221718.

It is an arithmetic number, because the mean of its divisors is an integer number (56676816).

Almost surely, 2^1251222620 is an apocalyptic number.

1251222620 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 1251222620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1360243584).

1251222620 is an abundant number, since it is smaller than the sum of its proper divisors (1469264548).

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

1251222620 is a wasteful number, since it uses less digits than its factorization.

1251222620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6110 (or 6108 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1251222620 is about 35372.6252913181. The cubic root of 1251222620 is about 1077.5684378987.

The spelling of 1251222620 in words is "one billion, two hundred fifty-one million, two hundred twenty-two thousand, six hundred twenty".