1251251201 has 2 divisors, whose sum is σ = 1251251202. Its totient is φ = 1251251200.

The previous prime is 1251251179. The next prime is 1251251227. The reversal of 1251251201 is 1021521521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1205756176 + 45495025 = 34724^2 + 6745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251251201 - 2¹⁸ = 1250989057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1251251101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625625600 + 625625601.

It is an arithmetic number, because the mean of its divisors is an integer number (625625601).

Almost surely, 2^1251251201 is an apocalyptic number.

It is an amenable number.

1251251201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251251201 is an equidigital number, since it uses as much as digits as its factorization.

1251251201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1251251201 is about 35373.0292878628. The cubic root of 1251251201 is about 1077.5766426068.

Adding to 1251251201 its reverse (1021521521), we get a palindrome (2272772722).

The spelling of 1251251201 in words is "one billion, two hundred fifty-one million, two hundred fifty-one thousand, two hundred one".