1251420530 has 16 divisors (see below), whose sum is σ = 2253343104. Its totient is φ = 500393520.

The previous prime is 1251420523. The next prime is 1251420563. The reversal of 1251420530 is 350241521.

It is a junction number, because it is equal to n+sod(n) for n = 1251420496 and 1251420505.

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, 10535 + ... + 51125.

It is an arithmetic number, because the mean of its divisors is an integer number (140833944).

Almost surely, 2^1251420530 is an apocalyptic number.

1251420530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1251420530 is a deficient number, since it is larger than the sum of its proper divisors (1001922574).

1251420530 is a wasteful number, since it uses less digits than its factorization.

1251420530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43681.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1251420530 is about 35375.4226829871. The cubic root of 1251420530 is about 1077.6252490856.

The spelling of 1251420530 in words is "one billion, two hundred fifty-one million, four hundred twenty thousand, five hundred thirty".