197417506621 has 2 divisors, whose sum is σ = 197417506622. Its totient is φ = 197417506620.

The previous prime is 197417506589. The next prime is 197417506639. The reversal of 197417506621 is 126605714791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197414930596 + 2576025 = 444314^2 + 1605^2 .

It is a cyclic number.

It is not a de Polignac number, because 197417506621 - 2⁵ = 197417506589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197417506651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98708753310 + 98708753311.

It is an arithmetic number, because the mean of its divisors is an integer number (98708753311).

Almost surely, 2^197417506621 is an apocalyptic number.

It is an amenable number.

197417506621 is a deficient number, since it is larger than the sum of its proper divisors (1).

197417506621 is an equidigital number, since it uses as much as digits as its factorization.

197417506621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 197417506621 in words is "one hundred ninety-seven billion, four hundred seventeen million, five hundred six thousand, six hundred twenty-one".