99281257 has 2 divisors, whose sum is σ = 99281258. Its totient is φ = 99281256.

The previous prime is 99281219. The next prime is 99281267. The reversal of 99281257 is 75218299.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91795561 + 7485696 = 9581^2 + 2736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99281257 is a prime.

It is not a weakly prime, because it can be changed into another prime (99281267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49640628 + 49640629.

It is an arithmetic number, because the mean of its divisors is an integer number (49640629).

Almost surely, 2^99281257 is an apocalyptic number.

It is an amenable number.

99281257 is a deficient number, since it is larger than the sum of its proper divisors (1).

99281257 is an equidigital number, since it uses as much as digits as its factorization.

99281257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 99281257 is about 9963.9980429544. The cubic root of 99281257 is about 463.0441719492.

The spelling of 99281257 in words is "ninety-nine million, two hundred eighty-one thousand, two hundred fifty-seven".