989694731 has 2 divisors, whose sum is σ = 989694732. Its totient is φ = 989694730.

The previous prime is 989694709. The next prime is 989694737. The reversal of 989694731 is 137496989.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989694731 is a prime.

It is a super-2 number, since 2×989694731² = 1958991321138324722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (989694737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494847365 + 494847366.

It is an arithmetic number, because the mean of its divisors is an integer number (494847366).

Almost surely, 2^989694731 is an apocalyptic number.

989694731 is a deficient number, since it is larger than the sum of its proper divisors (1).

989694731 is an equidigital number, since it uses as much as digits as its factorization.

989694731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 56.

The square root of 989694731 is about 31459.4140282364. The cubic root of 989694731 is about 996.5530424688.

The spelling of 989694731 in words is "nine hundred eighty-nine million, six hundred ninety-four thousand, seven hundred thirty-one".