1268890253 has 2 divisors, whose sum is σ = 1268890254. Its totient is φ = 1268890252.

The previous prime is 1268890241. The next prime is 1268890277. The reversal of 1268890253 is 3520988621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 924342409 + 344547844 = 30403^2 + 18562^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268890253 - 2⁴ = 1268890237 is a prime.

It is a super-2 number, since 2×1268890253² = 3220164948316808018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268890223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634445126 + 634445127.

It is an arithmetic number, because the mean of its divisors is an integer number (634445127).

Almost surely, 2^1268890253 is an apocalyptic number.

It is an amenable number.

1268890253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268890253 is an equidigital number, since it uses as much as digits as its factorization.

1268890253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 1268890253 is about 35621.4858336931. The cubic root of 1268890253 is about 1082.6166129105.

The spelling of 1268890253 in words is "one billion, two hundred sixty-eight million, eight hundred ninety thousand, two hundred fifty-three".