983712991 has 2 divisors, whose sum is σ = 983712992. Its totient is φ = 983712990.

The previous prime is 983712979. The next prime is 983712997. The reversal of 983712991 is 199217389.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 983712991 - 2¹⁵ = 983680223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (983712997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 491856495 + 491856496.

It is an arithmetic number, because the mean of its divisors is an integer number (491856496).

Almost surely, 2^983712991 is an apocalyptic number.

983712991 is a deficient number, since it is larger than the sum of its proper divisors (1).

983712991 is an equidigital number, since it uses as much as digits as its factorization.

983712991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 49.

The square root of 983712991 is about 31364.1991927101. The cubic root of 983712991 is about 994.5412533043.

The spelling of 983712991 in words is "nine hundred eighty-three million, seven hundred twelve thousand, nine hundred ninety-one".