1251999967 has 2 divisors, whose sum is σ = 1251999968. Its totient is φ = 1251999966.

The previous prime is 1251999953. The next prime is 1252000027. The reversal of 1251999967 is 7699991521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251999967 - 2²³ = 1243611359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251999667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625999983 + 625999984.

It is an arithmetic number, because the mean of its divisors is an integer number (625999984).

Almost surely, 2^1251999967 is an apocalyptic number.

1251999967 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251999967 is an equidigital number, since it uses as much as digits as its factorization.

1251999967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2755620, while the sum is 58.

The square root of 1251999967 is about 35383.6115595907. The cubic root of 1251999967 is about 1077.7915453275.

The spelling of 1251999967 in words is "one billion, two hundred fifty-one million, nine hundred ninety-nine thousand, nine hundred sixty-seven".