19752661 has 2 divisors, whose sum is σ = 19752662. Its totient is φ = 19752660.

The previous prime is 19752659. The next prime is 19752679. The reversal of 19752661 is 16625791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14485636 + 5267025 = 3806^2 + 2295^2 .

It is a cyclic number.

It is not a de Polignac number, because 19752661 - 2¹ = 19752659 is a prime.

Together with 19752659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19752661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19752631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9876330 + 9876331.

It is an arithmetic number, because the mean of its divisors is an integer number (9876331).

Almost surely, 2^19752661 is an apocalyptic number.

It is an amenable number.

19752661 is a deficient number, since it is larger than the sum of its proper divisors (1).

19752661 is an equidigital number, since it uses as much as digits as its factorization.

19752661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 19752661 is about 4444.3965844645. The cubic root of 19752661 is about 270.3181480616.

The spelling of 19752661 in words is "nineteen million, seven hundred fifty-two thousand, six hundred sixty-one".