1251046563 has 16 divisors (see below), whose sum is σ = 1802783136. Its totient is φ = 767128320.

The previous prime is 1251046543. The next prime is 1251046603. The reversal of 1251046563 is 3656401521.

It is not a de Polignac number, because 1251046563 - 2¹² = 1251042467 is a prime.

It is a super-2 number, since 2×1251046563² = 3130235005588225938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1251046513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46120 + ... + 68037.

It is an arithmetic number, because the mean of its divisors is an integer number (112673946).

Almost surely, 2^1251046563 is an apocalyptic number.

1251046563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1251046563 is a deficient number, since it is larger than the sum of its proper divisors (551736573).

1251046563 is a wasteful number, since it uses less digits than its factorization.

1251046563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114454.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1251046563 is about 35370.1365985488. The cubic root of 1251046563 is about 1077.5178947041.

The spelling of 1251046563 in words is "one billion, two hundred fifty-one million, forty-six thousand, five hundred sixty-three".