99722981 has 2 divisors, whose sum is σ = 99722982. Its totient is φ = 99722980.

The previous prime is 99722971. The next prime is 99722999. The reversal of 99722981 is 18922799.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96628900 + 3094081 = 9830^2 + 1759^2 .

It is a cyclic number.

It is not a de Polignac number, because 99722981 - 2¹⁰ = 99721957 is a prime.

It is a super-2 number, since 2×99722981² = 19889345879052722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99722941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49861490 + 49861491.

It is an arithmetic number, because the mean of its divisors is an integer number (49861491).

Almost surely, 2^99722981 is an apocalyptic number.

It is an amenable number.

99722981 is a deficient number, since it is larger than the sum of its proper divisors (1).

99722981 is an equidigital number, since it uses as much as digits as its factorization.

99722981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 99722981 is about 9986.1394442497. The cubic root of 99722981 is about 463.7298842150.

The spelling of 99722981 in words is "ninety-nine million, seven hundred twenty-two thousand, nine hundred eighty-one".