97811969 has 2 divisors, whose sum is σ = 97811970. Its totient is φ = 97811968.

The previous prime is 97811963. The next prime is 97812007. The reversal of 97811969 is 96911879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79210000 + 18601969 = 8900^2 + 4313^2 .

It is a cyclic number.

It is not a de Polignac number, because 97811969 - 2⁴ = 97811953 is a prime.

It is a super-2 number, since 2×97811969² = 19134362559313922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97811963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48905984 + 48905985.

It is an arithmetic number, because the mean of its divisors is an integer number (48905985).

Almost surely, 2^97811969 is an apocalyptic number.

It is an amenable number.

97811969 is a deficient number, since it is larger than the sum of its proper divisors (1).

97811969 is an equidigital number, since it uses as much as digits as its factorization.

97811969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 50.

The square root of 97811969 is about 9889.9933771464. The cubic root of 97811969 is about 460.7485747919.

The spelling of 97811969 in words is "ninety-seven million, eight hundred eleven thousand, nine hundred sixty-nine".