61772197 has 2 divisors, whose sum is σ = 61772198. Its totient is φ = 61772196.

The previous prime is 61772171. The next prime is 61772239. The reversal of 61772197 is 79127716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56160036 + 5612161 = 7494^2 + 2369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61772197 is a prime.

It is equal to p_3660898 and since 61772197 and 3660898 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61772167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30886098 + 30886099.

It is an arithmetic number, because the mean of its divisors is an integer number (30886099).

Almost surely, 2^61772197 is an apocalyptic number.

It is an amenable number.

61772197 is a deficient number, since it is larger than the sum of its proper divisors (1).

61772197 is an equidigital number, since it uses as much as digits as its factorization.

61772197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37044, while the sum is 40.

The square root of 61772197 is about 7859.5290571382. The cubic root of 61772197 is about 395.3038243562.

The spelling of 61772197 in words is "sixty-one million, seven hundred seventy-two thousand, one hundred ninety-seven".