19975531 has 2 divisors, whose sum is σ = 19975532. Its totient is φ = 19975530.

The previous prime is 19975513. The next prime is 19975537. The reversal of 19975531 is 13557991.

Together with previous prime (19975513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13557991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19975531 - 2⁵ = 19975499 is a prime.

It is a super-2 number, since 2×19975531² = 798043677463922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19975537) 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, 9987765 + 9987766.

It is an arithmetic number, because the mean of its divisors is an integer number (9987766).

Almost surely, 2^19975531 is an apocalyptic number.

19975531 is a deficient number, since it is larger than the sum of its proper divisors (1).

19975531 is an equidigital number, since it uses as much as digits as its factorization.

19975531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42525, while the sum is 40.

The square root of 19975531 is about 4469.3994003669. The cubic root of 19975531 is about 271.3310180097.

The spelling of 19975531 in words is "nineteen million, nine hundred seventy-five thousand, five hundred thirty-one".