97561421 has 2 divisors, whose sum is σ = 97561422. Its totient is φ = 97561420.

The previous prime is 97561417. The next prime is 97561439. The reversal of 97561421 is 12416579.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97515625 + 45796 = 9875^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 97561421 - 2² = 97561417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97561411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48780710 + 48780711.

It is an arithmetic number, because the mean of its divisors is an integer number (48780711).

Almost surely, 2^97561421 is an apocalyptic number.

It is an amenable number.

97561421 is a deficient number, since it is larger than the sum of its proper divisors (1).

97561421 is an equidigital number, since it uses as much as digits as its factorization.

97561421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 97561421 is about 9877.3185126329. The cubic root of 97561421 is about 460.3548317669.

The spelling of 97561421 in words is "ninety-seven million, five hundred sixty-one thousand, four hundred twenty-one".