97737936581 has 2 divisors, whose sum is σ = 97737936582. Its totient is φ = 97737936580.

The previous prime is 97737936577. The next prime is 97737936601. The reversal of 97737936581 is 18563973779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92814669025 + 4923267556 = 304655^2 + 70166^2 .

It is a cyclic number.

It is not a de Polignac number, because 97737936581 - 2² = 97737936577 is a prime.

It is a super-2 number, since 2×97737936581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97737930581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48868968290 + 48868968291.

It is an arithmetic number, because the mean of its divisors is an integer number (48868968291).

Almost surely, 2^97737936581 is an apocalyptic number.

It is an amenable number.

97737936581 is a deficient number, since it is larger than the sum of its proper divisors (1).

97737936581 is an equidigital number, since it uses as much as digits as its factorization.

97737936581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60011280, while the sum is 65.

The spelling of 97737936581 in words is "ninety-seven billion, seven hundred thirty-seven million, nine hundred thirty-six thousand, five hundred eighty-one".