981619693 has 2 divisors, whose sum is σ = 981619694. Its totient is φ = 981619692.

The previous prime is 981619679. The next prime is 981619699. The reversal of 981619693 is 396916189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 875982409 + 105637284 = 29597^2 + 10278^2 .

It is an emirp because it is prime and its reverse (396916189) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981619693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 981619693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981619699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490809846 + 490809847.

It is an arithmetic number, because the mean of its divisors is an integer number (490809847).

Almost surely, 2^981619693 is an apocalyptic number.

It is an amenable number.

981619693 is a deficient number, since it is larger than the sum of its proper divisors (1).

981619693 is an equidigital number, since it uses as much as digits as its factorization.

981619693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 52.

The square root of 981619693 is about 31330.8106023448. The cubic root of 981619693 is about 993.8353056366.

The spelling of 981619693 in words is "nine hundred eighty-one million, six hundred nineteen thousand, six hundred ninety-three".