1251420898 has 48 divisors (see below), whose sum is σ = 2489941944. Its totient is φ = 465937920.

The previous prime is 1251420893. The next prime is 1251420967. The reversal of 1251420898 is 8980241521.

It can be written as a sum of positive squares in 4 ways, for example, as 1156884169 + 94536729 = 34013^2 + 9723^2 .

It is a super-2 number, since 2×1251420898² = 3132108527902252808, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1251420898.

It is not an unprimeable number, because it can be changed into a prime (1251420893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7233 + ... + 50548.

Almost surely, 2^1251420898 is an apocalyptic number.

1251420898 is a deficient number, since it is larger than the sum of its proper divisors (1238521046).

1251420898 is a wasteful number, since it uses less digits than its factorization.

1251420898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57827 (or 57820 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 1251420898 is about 35375.4278843380. The cubic root of 1251420898 is about 1077.6253547166.

The spelling of 1251420898 in words is "one billion, two hundred fifty-one million, four hundred twenty thousand, eight hundred ninety-eight".