1251012457 has 2 divisors, whose sum is σ = 1251012458. Its totient is φ = 1251012456.

The previous prime is 1251012407. The next prime is 1251012467. The reversal of 1251012457 is 7542101521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 816873561 + 434138896 = 28581^2 + 20836^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251012457 - 2¹⁵ = 1250979689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251012407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625506228 + 625506229.

It is an arithmetic number, because the mean of its divisors is an integer number (625506229).

Almost surely, 2^1251012457 is an apocalyptic number.

It is an amenable number.

1251012457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251012457 is an equidigital number, since it uses as much as digits as its factorization.

1251012457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 1251012457 is about 35369.6544653747. The cubic root of 1251012457 is about 1077.5081028598.

Adding to 1251012457 its reverse (7542101521), we get a palindrome (8793113978).

The spelling of 1251012457 in words is "one billion, two hundred fifty-one million, twelve thousand, four hundred fifty-seven".