19525997 has 2 divisors, whose sum is σ = 19525998. Its totient is φ = 19525996.

The previous prime is 19525969. The next prime is 19526029. The reversal of 19525997 is 79952591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15319396 + 4206601 = 3914^2 + 2051^2 .

It is an emirp because it is prime and its reverse (79952591) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19525997 is a prime.

It is a super-3 number, since 3×19525997³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19525907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9762998 + 9762999.

It is an arithmetic number, because the mean of its divisors is an integer number (9762999).

Almost surely, 2^19525997 is an apocalyptic number.

It is an amenable number.

19525997 is a deficient number, since it is larger than the sum of its proper divisors (1).

19525997 is an equidigital number, since it uses as much as digits as its factorization.

19525997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 255150, while the sum is 47.

The square root of 19525997 is about 4418.8230333427. The cubic root of 19525997 is about 269.2801906323.

The spelling of 19525997 in words is "nineteen million, five hundred twenty-five thousand, nine hundred ninety-seven".