97278949 has 2 divisors, whose sum is σ = 97278950. Its totient is φ = 97278948.

The previous prime is 97278911. The next prime is 97278953. The reversal of 97278949 is 94987279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66830625 + 30448324 = 8175^2 + 5518^2 .

It is a cyclic number.

It is not a de Polignac number, because 97278949 - 2⁷ = 97278821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97278949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97278959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48639474 + 48639475.

It is an arithmetic number, because the mean of its divisors is an integer number (48639475).

Almost surely, 2^97278949 is an apocalyptic number.

It is an amenable number.

97278949 is a deficient number, since it is larger than the sum of its proper divisors (1).

97278949 is an equidigital number, since it uses as much as digits as its factorization.

97278949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 55.

The square root of 97278949 is about 9863.0091250085. The cubic root of 97278949 is about 459.9101100347.

The spelling of 97278949 in words is "ninety-seven million, two hundred seventy-eight thousand, nine hundred forty-nine".