1251425432399 has 2 divisors, whose sum is σ = 1251425432400. Its totient is φ = 1251425432398.

The previous prime is 1251425432381. The next prime is 1251425432429. The reversal of 1251425432399 is 9932345241521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251425432399 - 2¹² = 1251425428303 is a prime.

It is a super-2 number, since 2×1251425432399² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251425432099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625712716199 + 625712716200.

It is an arithmetic number, because the mean of its divisors is an integer number (625712716200).

Almost surely, 2^{1251425432399} is an apocalyptic number.

1251425432399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251425432399 is an equidigital number, since it uses as much as digits as its factorization.

1251425432399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 50.

The spelling of 1251425432399 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-five million, four hundred thirty-two thousand, three hundred ninety-nine".