1897650899 has 2 divisors, whose sum is σ = 1897650900. Its totient is φ = 1897650898.

The previous prime is 1897650883. The next prime is 1897650901. The reversal of 1897650899 is 9980567981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1897650899 - 2⁴ = 1897650883 is a prime.

Together with 1897650901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1897650809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948825449 + 948825450.

It is an arithmetic number, because the mean of its divisors is an integer number (948825450).

Almost surely, 2^1897650899 is an apocalyptic number.

1897650899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897650899 is an equidigital number, since it uses as much as digits as its factorization.

1897650899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9797760, while the sum is 62.

The square root of 1897650899 is about 43562.0350649508. The cubic root of 1897650899 is about 1238.0516791203.

The spelling of 1897650899 in words is "one billion, eight hundred ninety-seven million, six hundred fifty thousand, eight hundred ninety-nine".