97078981 has 2 divisors, whose sum is σ = 97078982. Its totient is φ = 97078980.

The previous prime is 97078967. The next prime is 97079053. The reversal of 97078981 is 18987079.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80838081 + 16240900 = 8991^2 + 4030^2 .

It is a cyclic number.

It is not a de Polignac number, because 97078981 - 2²¹ = 94981829 is a prime.

It is a super-2 number, since 2×97078981² = 18848657103996722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97078901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48539490 + 48539491.

It is an arithmetic number, because the mean of its divisors is an integer number (48539491).

Almost surely, 2^97078981 is an apocalyptic number.

97078981 is the 6232-nd centered pentagonal number.

It is an amenable number.

97078981 is a deficient number, since it is larger than the sum of its proper divisors (1).

97078981 is an equidigital number, since it uses as much as digits as its factorization.

97078981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 97078981 is about 9852.8666386996. The cubic root of 97078981 is about 459.5947612557.

The spelling of 97078981 in words is "ninety-seven million, seventy-eight thousand, nine hundred eighty-one".