1251721283 has 2 divisors, whose sum is σ = 1251721284. Its totient is φ = 1251721282.

The previous prime is 1251721253. The next prime is 1251721309. The reversal of 1251721283 is 3821271521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1251721283 - 2²⁶ = 1184612419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251721213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625860641 + 625860642.

It is an arithmetic number, because the mean of its divisors is an integer number (625860642).

Almost surely, 2^1251721283 is an apocalyptic number.

1251721283 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251721283 is an equidigital number, since it uses as much as digits as its factorization.

1251721283 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 32.

The square root of 1251721283 is about 35379.6733026183. The cubic root of 1251721283 is about 1077.7115704724.

The spelling of 1251721283 in words is "one billion, two hundred fifty-one million, seven hundred twenty-one thousand, two hundred eighty-three".