97561493 has 2 divisors, whose sum is σ = 97561494. Its totient is φ = 97561492.

The previous prime is 97561439. The next prime is 97561501. The reversal of 97561493 is 39416579.

Together with previous prime (97561439) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51008164 + 46553329 = 7142^2 + 6823^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97561493 is a prime.

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 (97501493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48780746 + 48780747.

It is an arithmetic number, because the mean of its divisors is an integer number (48780747).

Almost surely, 2^97561493 is an apocalyptic number.

It is an amenable number.

97561493 is a deficient number, since it is larger than the sum of its proper divisors (1).

97561493 is an equidigital number, since it uses as much as digits as its factorization.

97561493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 44.

The square root of 97561493 is about 9877.3221573461. The cubic root of 97561493 is about 460.3549450136.

The spelling of 97561493 in words is "ninety-seven million, five hundred sixty-one thousand, four hundred ninety-three".