1897403950009 has 2 divisors, whose sum is σ = 1897403950010. Its totient is φ = 1897403950008.

The previous prime is 1897403949989. The next prime is 1897403950063. The reversal of 1897403950009 is 9000593047981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1656955923984 + 240448026025 = 1287228^2 + 490355^2 .

It is a cyclic number.

It is not a de Polignac number, because 1897403950009 - 2²⁵ = 1897370395577 is a prime.

It is a super-2 number, since 2×1897403950009² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1897403950609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948701975004 + 948701975005.

It is an arithmetic number, because the mean of its divisors is an integer number (948701975005).

Almost surely, 2^{1897403950009} is an apocalyptic number.

It is an amenable number.

1897403950009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897403950009 is an equidigital number, since it uses as much as digits as its factorization.

1897403950009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 1897403950009 in words is "one trillion, eight hundred ninety-seven billion, four hundred three million, nine hundred fifty thousand, nine".