1250881001 has 2 divisors, whose sum is σ = 1250881002. Its totient is φ = 1250881000.

The previous prime is 1250880991. The next prime is 1250881043. The reversal of 1250881001 is 1001880521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 925619776 + 325261225 = 30424^2 + 18035^2 .

It is a cyclic number.

It is not a de Polignac number, because 1250881001 - 2¹⁴ = 1250864617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1250881091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625440500 + 625440501.

It is an arithmetic number, because the mean of its divisors is an integer number (625440501).

Almost surely, 2^1250881001 is an apocalyptic number.

It is an amenable number.

1250881001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1250881001 is an equidigital number, since it uses as much as digits as its factorization.

1250881001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 1250881001 is about 35367.7961004075. The cubic root of 1250881001 is about 1077.4703601323.

The spelling of 1250881001 in words is "one billion, two hundred fifty million, eight hundred eighty-one thousand, one".