97628281 has 2 divisors, whose sum is σ = 97628282. Its totient is φ = 97628280.

The previous prime is 97628273. The next prime is 97628287. The reversal of 97628281 is 18282679.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91298025 + 6330256 = 9555^2 + 2516^2 .

It is a cyclic number.

It is not a de Polignac number, because 97628281 - 2³ = 97628273 is a prime.

It is a super-2 number, since 2×97628281² = 19062562502029922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97628287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48814140 + 48814141.

It is an arithmetic number, because the mean of its divisors is an integer number (48814141).

Almost surely, 2^97628281 is an apocalyptic number.

It is an amenable number.

97628281 is a deficient number, since it is larger than the sum of its proper divisors (1).

97628281 is an equidigital number, since it uses as much as digits as its factorization.

97628281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 97628281 is about 9880.7024547853. The cubic root of 97628281 is about 460.4599699635.

The spelling of 97628281 in words is "ninety-seven million, six hundred twenty-eight thousand, two hundred eighty-one".