97678939 has 2 divisors, whose sum is σ = 97678940. Its totient is φ = 97678938.

The previous prime is 97678921. The next prime is 97678949. The reversal of 97678939 is 93987679.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97678939 - 2¹⁷ = 97547867 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97678949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48839469 + 48839470.

It is an arithmetic number, because the mean of its divisors is an integer number (48839470).

Almost surely, 2^97678939 is an apocalyptic number.

97678939 is a deficient number, since it is larger than the sum of its proper divisors (1).

97678939 is an equidigital number, since it uses as much as digits as its factorization.

97678939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5143824, while the sum is 58.

The square root of 97678939 is about 9883.2656040400. The cubic root of 97678939 is about 460.5395983511.

The spelling of 97678939 in words is "ninety-seven million, six hundred seventy-eight thousand, nine hundred thirty-nine".