97278457 has 2 divisors, whose sum is σ = 97278458. Its totient is φ = 97278456.

The previous prime is 97278451. The next prime is 97278473. The reversal of 97278457 is 75487279.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75272976 + 22005481 = 8676^2 + 4691^2 .

It is a cyclic number.

It is not a de Polignac number, because 97278457 - 2⁷ = 97278329 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97278457.

It is not a weakly prime, because it can be changed into another prime (97278451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48639228 + 48639229.

It is an arithmetic number, because the mean of its divisors is an integer number (48639229).

Almost surely, 2^97278457 is an apocalyptic number.

It is an amenable number.

97278457 is a deficient number, since it is larger than the sum of its proper divisors (1).

97278457 is an equidigital number, since it uses as much as digits as its factorization.

97278457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 49.

The square root of 97278457 is about 9862.9841832987. The cubic root of 97278457 is about 459.9093346832.

The spelling of 97278457 in words is "ninety-seven million, two hundred seventy-eight thousand, four hundred fifty-seven".