1251345413 has 2 divisors, whose sum is σ = 1251345414. Its totient is φ = 1251345412.

The previous prime is 1251345409. The next prime is 1251345463. The reversal of 1251345413 is 3145431521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 714867169 + 536478244 = 26737^2 + 23162^2 .

It is an emirp because it is prime and its reverse (3145431521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1251345413 - 2² = 1251345409 is a prime.

It is a super-2 number, since 2×1251345413² = 3131730685272281138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251345463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625672706 + 625672707.

It is an arithmetic number, because the mean of its divisors is an integer number (625672707).

Almost surely, 2^1251345413 is an apocalyptic number.

It is an amenable number.

1251345413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251345413 is an equidigital number, since it uses as much as digits as its factorization.

1251345413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 1251345413 is about 35374.3609553586. The cubic root of 1251345413 is about 1077.6036870305.

Adding to 1251345413 its reverse (3145431521), we get a palindrome (4396776934).

The spelling of 1251345413 in words is "one billion, two hundred fifty-one million, three hundred forty-five thousand, four hundred thirteen".