19919953 has 2 divisors, whose sum is σ = 19919954. Its totient is φ = 19919952.

The previous prime is 19919947. The next prime is 19919957. The reversal of 19919953 is 35991991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13483584 + 6436369 = 3672^2 + 2537^2 .

It is a cyclic number.

It is not a de Polignac number, because 19919953 - 2¹³ = 19911761 is a prime.

It is not a weakly prime, because it can be changed into another prime (19919957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9959976 + 9959977.

It is an arithmetic number, because the mean of its divisors is an integer number (9959977).

Almost surely, 2^19919953 is an apocalyptic number.

It is an amenable number.

19919953 is a deficient number, since it is larger than the sum of its proper divisors (1).

19919953 is an equidigital number, since it uses as much as digits as its factorization.

19919953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98415, while the sum is 46.

The square root of 19919953 is about 4463.1774555803. The cubic root of 19919953 is about 271.0791424738.

The spelling of 19919953 in words is "nineteen million, nine hundred nineteen thousand, nine hundred fifty-three".