19900057 has 2 divisors, whose sum is σ = 19900058. Its totient is φ = 19900056.

The previous prime is 19900009. The next prime is 19900123. The reversal of 19900057 is 75000991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10634121 + 9265936 = 3261^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 19900057 - 2¹¹ = 19898009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19900157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950028 + 9950029.

It is an arithmetic number, because the mean of its divisors is an integer number (9950029).

Almost surely, 2^19900057 is an apocalyptic number.

It is an amenable number.

19900057 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900057 is an equidigital number, since it uses as much as digits as its factorization.

19900057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2835, while the sum is 31.

The square root of 19900057 is about 4460.9479934202. The cubic root of 19900057 is about 270.9888613496.

The spelling of 19900057 in words is "nineteen million, nine hundred thousand, fifty-seven".