1251101513 has 2 divisors, whose sum is σ = 1251101514. Its totient is φ = 1251101512.

The previous prime is 1251101497. The next prime is 1251101563. The reversal of 1251101513 is 3151011521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1250117449 + 984064 = 35357^2 + 992^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251101513 - 2⁴ = 1251101497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251101563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625550756 + 625550757.

It is an arithmetic number, because the mean of its divisors is an integer number (625550757).

Almost surely, 2^1251101513 is an apocalyptic number.

It is an amenable number.

1251101513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251101513 is an equidigital number, since it uses as much as digits as its factorization.

1251101513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 1251101513 is about 35370.9133752579. The cubic root of 1251101513 is about 1077.5336704935.

The spelling of 1251101513 in words is "one billion, two hundred fifty-one million, one hundred one thousand, five hundred thirteen".