1251420563 has 2 divisors, whose sum is σ = 1251420564. Its totient is φ = 1251420562.

The previous prime is 1251420523. The next prime is 1251420649. The reversal of 1251420563 is 3650241521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251420563 - 2²² = 1247226259 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251420523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625710281 + 625710282.

It is an arithmetic number, because the mean of its divisors is an integer number (625710282).

Almost surely, 2^1251420563 is an apocalyptic number.

1251420563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251420563 is an equidigital number, since it uses as much as digits as its factorization.

1251420563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1251420563 is about 35375.4231494126. The cubic root of 1251420563 is about 1077.6252585580.

The spelling of 1251420563 in words is "one billion, two hundred fifty-one million, four hundred twenty thousand, five hundred sixty-three".