1901257009 has 2 divisors, whose sum is σ = 1901257010. Its totient is φ = 1901257008.

The previous prime is 1901256989. The next prime is 1901257037. The reversal of 1901257009 is 9007521091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1032658225 + 868598784 = 32135^2 + 29472^2 .

It is a cyclic number.

It is not a de Polignac number, because 1901257009 - 2¹⁹ = 1900732721 is a prime.

It is a super-2 number, since 2×1901257009² = 7229556428543252162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1901257409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950628504 + 950628505.

It is an arithmetic number, because the mean of its divisors is an integer number (950628505).

Almost surely, 2^1901257009 is an apocalyptic number.

It is an amenable number.

1901257009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901257009 is an equidigital number, since it uses as much as digits as its factorization.

1901257009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 1901257009 is about 43603.4059334818. The cubic root of 1901257009 is about 1238.8354069609.

The spelling of 1901257009 in words is "one billion, nine hundred one million, two hundred fifty-seven thousand, nine".