19609631 has 2 divisors, whose sum is σ = 19609632. Its totient is φ = 19609630.

The previous prime is 19609607. The next prime is 19609643. The reversal of 19609631 is 13690691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19609631 - 2⁶ = 19609567 is a prime.

It is a super-2 number, since 2×19609631² = 769075255912322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19609591 and 19609600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19609651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9804815 + 9804816.

It is an arithmetic number, because the mean of its divisors is an integer number (9804816).

Almost surely, 2^19609631 is an apocalyptic number.

19609631 is a deficient number, since it is larger than the sum of its proper divisors (1).

19609631 is an equidigital number, since it uses as much as digits as its factorization.

19609631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 19609631 is about 4428.2763012260. The cubic root of 19609631 is about 269.6641044764.

The spelling of 19609631 in words is "nineteen million, six hundred nine thousand, six hundred thirty-one".