981322757 has 2 divisors, whose sum is σ = 981322758. Its totient is φ = 981322756.

The previous prime is 981322747. The next prime is 981322759. The reversal of 981322757 is 757223189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935503396 + 45819361 = 30586^2 + 6769^2 .

It is an emirp because it is prime and its reverse (757223189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981322757 - 2²⁰ = 980274181 is a prime.

Together with 981322759, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981322759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490661378 + 490661379.

It is an arithmetic number, because the mean of its divisors is an integer number (490661379).

Almost surely, 2^981322757 is an apocalyptic number.

It is an amenable number.

981322757 is a deficient number, since it is larger than the sum of its proper divisors (1).

981322757 is an equidigital number, since it uses as much as digits as its factorization.

981322757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 981322757 is about 31326.0715219767. The cubic root of 981322757 is about 993.7350851393.

The spelling of 981322757 in words is "nine hundred eighty-one million, three hundred twenty-two thousand, seven hundred fifty-seven".