1251790513 has 2 divisors, whose sum is σ = 1251790514. Its totient is φ = 1251790512.

The previous prime is 1251790499. The next prime is 1251790523. The reversal of 1251790513 is 3150971521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 719473329 + 532317184 = 26823^2 + 23072^2 .

It is an emirp because it is prime and its reverse (3150971521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251790513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251790523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625895256 + 625895257.

It is an arithmetic number, because the mean of its divisors is an integer number (625895257).

Almost surely, 2^1251790513 is an apocalyptic number.

It is an amenable number.

1251790513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251790513 is an equidigital number, since it uses as much as digits as its factorization.

1251790513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 1251790513 is about 35380.6516757394. The cubic root of 1251790513 is about 1077.7314387390.

The spelling of 1251790513 in words is "one billion, two hundred fifty-one million, seven hundred ninety thousand, five hundred thirteen".