1900019031857 has 2 divisors, whose sum is σ = 1900019031858. Its totient is φ = 1900019031856.

The previous prime is 1900019031853. The next prime is 1900019031893. The reversal of 1900019031857 is 7581309100091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1511820252721 + 388198779136 = 1229561^2 + 623056^2 .

It is a cyclic number.

It is not a de Polignac number, because 1900019031857 - 2² = 1900019031853 is a prime.

It is a super-2 number, since 2×1900019031857² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1900019031853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950009515928 + 950009515929.

It is an arithmetic number, because the mean of its divisors is an integer number (950009515929).

Almost surely, 2^{1900019031857} is an apocalyptic number.

It is an amenable number.

1900019031857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1900019031857 is an equidigital number, since it uses as much as digits as its factorization.

1900019031857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 44.

The spelling of 1900019031857 in words is "one trillion, nine hundred billion, nineteen million, thirty-one thousand, eight hundred fifty-seven".