97486511981 has 2 divisors, whose sum is σ = 97486511982. Its totient is φ = 97486511980.

The previous prime is 97486511933. The next prime is 97486512103. The reversal of 97486511981 is 18911568479.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79459153225 + 18027358756 = 281885^2 + 134266^2 .

It is a cyclic number.

It is not a de Polignac number, because 97486511981 - 2¹⁸ = 97486249837 is a prime.

It is a super-2 number, since 2×97486511981² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 97486511981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97486511581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48743255990 + 48743255991.

It is an arithmetic number, because the mean of its divisors is an integer number (48743255991).

Almost surely, 2^97486511981 is an apocalyptic number.

It is an amenable number.

97486511981 is a deficient number, since it is larger than the sum of its proper divisors (1).

97486511981 is an equidigital number, since it uses as much as digits as its factorization.

97486511981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 59.

The spelling of 97486511981 in words is "ninety-seven billion, four hundred eighty-six million, five hundred eleven thousand, nine hundred eighty-one".