1251713013 has 4 divisors (see below), whose sum is σ = 1668950688. Its totient is φ = 834475340.

The previous prime is 1251713003. The next prime is 1251713017. The reversal of 1251713013 is 3103171521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1251713013 - 2¹⁴ = 1251696629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251713017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208618833 + ... + 208618838.

It is an arithmetic number, because the mean of its divisors is an integer number (417237672).

Almost surely, 2^1251713013 is an apocalyptic number.

It is an amenable number.

1251713013 is a deficient number, since it is larger than the sum of its proper divisors (417237675).

1251713013 is an equidigital number, since it uses as much as digits as its factorization.

1251713013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417237674.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 1251713013 is about 35379.5564274059. The cubic root of 1251713013 is about 1077.7091970222.

Adding to 1251713013 its reverse (3103171521), we get a palindrome (4354884534).

The spelling of 1251713013 in words is "one billion, two hundred fifty-one million, seven hundred thirteen thousand, thirteen".