99281947 has 2 divisors, whose sum is σ = 99281948. Its totient is φ = 99281946.

The previous prime is 99281911. The next prime is 99281981. The reversal of 99281947 is 74918299.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99281947 is a prime.

It is a super-2 number, since 2×99281947² = 19713810000221618, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99281947.

It is not a weakly prime, because it can be changed into another prime (99282947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49640973 + 49640974.

It is an arithmetic number, because the mean of its divisors is an integer number (49640974).

Almost surely, 2^99281947 is an apocalyptic number.

99281947 is a deficient number, since it is larger than the sum of its proper divisors (1).

99281947 is an equidigital number, since it uses as much as digits as its factorization.

99281947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 99281947 is about 9964.0326675498. The cubic root of 99281947 is about 463.0452446584.

The spelling of 99281947 in words is "ninety-nine million, two hundred eighty-one thousand, nine hundred forty-seven".