97018781 has 2 divisors, whose sum is σ = 97018782. Its totient is φ = 97018780.

The previous prime is 97018759. The next prime is 97018787. The reversal of 97018781 is 18781079.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81613156 + 15405625 = 9034^2 + 3925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97018781 is a prime.

It is a super-2 number, since 2×97018781² = 18825287733451922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97018787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48509390 + 48509391.

It is an arithmetic number, because the mean of its divisors is an integer number (48509391).

Almost surely, 2^97018781 is an apocalyptic number.

It is an amenable number.

97018781 is a deficient number, since it is larger than the sum of its proper divisors (1).

97018781 is an equidigital number, since it uses as much as digits as its factorization.

97018781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 97018781 is about 9849.8112164650. The cubic root of 97018781 is about 459.4997412856.

The spelling of 97018781 in words is "ninety-seven million, eighteen thousand, seven hundred eighty-one".