1251376397 has 2 divisors, whose sum is σ = 1251376398. Its totient is φ = 1251376396.

The previous prime is 1251376381. The next prime is 1251376447. The reversal of 1251376397 is 7936731521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1248986281 + 2390116 = 35341^2 + 1546^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251376397 - 2⁴ = 1251376381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251376097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625688198 + 625688199.

It is an arithmetic number, because the mean of its divisors is an integer number (625688199).

Almost surely, 2^1251376397 is an apocalyptic number.

It is an amenable number.

1251376397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251376397 is an equidigital number, since it uses as much as digits as its factorization.

1251376397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238140, while the sum is 44.

The square root of 1251376397 is about 35374.7988969549. The cubic root of 1251376397 is about 1077.6125809769.

The spelling of 1251376397 in words is "one billion, two hundred fifty-one million, three hundred seventy-six thousand, three hundred ninety-seven".