97393781 has 2 divisors, whose sum is σ = 97393782. Its totient is φ = 97393780.

The previous prime is 97393763. The next prime is 97393811. The reversal of 97393781 is 18739379.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58767556 + 38626225 = 7666^2 + 6215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97393781 is a prime.

It is a super-2 number, since 2×97393781² = 18971097154951922, 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 (97393181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48696890 + 48696891.

It is an arithmetic number, because the mean of its divisors is an integer number (48696891).

Almost surely, 2^97393781 is an apocalyptic number.

It is an amenable number.

97393781 is a deficient number, since it is larger than the sum of its proper divisors (1).

97393781 is an equidigital number, since it uses as much as digits as its factorization.

97393781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 47.

The square root of 97393781 is about 9868.8287552272. The cubic root of 97393781 is about 460.0910043642.

It can be divided in two parts, 9739378 and 1, that added together give a palindrome (9739379).

The spelling of 97393781 in words is "ninety-seven million, three hundred ninety-three thousand, seven hundred eighty-one".