19979527 has 2 divisors, whose sum is σ = 19979528. Its totient is φ = 19979526.

The previous prime is 19979503. The next prime is 19979537. The reversal of 19979527 is 72597991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19979527 - 2¹⁹ = 19455239 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19979537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9989763 + 9989764.

It is an arithmetic number, because the mean of its divisors is an integer number (9989764).

Almost surely, 2^19979527 is an apocalyptic number.

19979527 is a deficient number, since it is larger than the sum of its proper divisors (1).

19979527 is an equidigital number, since it uses as much as digits as its factorization.

19979527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 357210, while the sum is 49.

The square root of 19979527 is about 4469.8464179432. The cubic root of 19979527 is about 271.3491095848.

The spelling of 19979527 in words is "nineteen million, nine hundred seventy-nine thousand, five hundred twenty-seven".