75978197 has 2 divisors, whose sum is σ = 75978198. Its totient is φ = 75978196.

The previous prime is 75978193. The next prime is 75978209. The reversal of 75978197 is 79187957.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68790436 + 7187761 = 8294^2 + 2681^2 .

It is a cyclic number.

It is not a de Polignac number, because 75978197 - 2² = 75978193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75978191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37989098 + 37989099.

It is an arithmetic number, because the mean of its divisors is an integer number (37989099).

Almost surely, 2^75978197 is an apocalyptic number.

It is an amenable number.

75978197 is a deficient number, since it is larger than the sum of its proper divisors (1).

75978197 is an equidigital number, since it uses as much as digits as its factorization.

75978197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1111320, while the sum is 53.

The square root of 75978197 is about 8716.5473095716. The cubic root of 75978197 is about 423.5418485595.

The spelling of 75978197 in words is "seventy-five million, nine hundred seventy-eight thousand, one hundred ninety-seven".