1251420902 has 16 divisors (see below), whose sum is σ = 1989198000. Its totient is φ = 588797280.

The previous prime is 1251420893. The next prime is 1251420967. The reversal of 1251420902 is 2090241521.

It is a congruent number.

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, 104849 + ... + 116172.

It is an arithmetic number, because the mean of its divisors is an integer number (124324875).

Almost surely, 2^1251420902 is an apocalyptic number.

1251420902 is a deficient number, since it is larger than the sum of its proper divisors (737777098).

1251420902 is a wasteful number, since it uses less digits than its factorization.

1251420902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221191.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1251420902 is about 35375.4279408744. The cubic root of 1251420902 is about 1077.6253558647.

The spelling of 1251420902 in words is "one billion, two hundred fifty-one million, four hundred twenty thousand, nine hundred two".