61775797 has 2 divisors, whose sum is σ = 61775798. Its totient is φ = 61775796.

The previous prime is 61775767. The next prime is 61775849. The reversal of 61775797 is 79757716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44809636 + 16966161 = 6694^2 + 4119^2 .

It is a cyclic number.

It is not a de Polignac number, because 61775797 - 2¹⁵ = 61743029 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61775797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61775767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30887898 + 30887899.

It is an arithmetic number, because the mean of its divisors is an integer number (30887899).

Almost surely, 2^61775797 is an apocalyptic number.

It is an amenable number.

61775797 is a deficient number, since it is larger than the sum of its proper divisors (1).

61775797 is an equidigital number, since it uses as much as digits as its factorization.

61775797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648270, while the sum is 49.

The square root of 61775797 is about 7859.7580751573. The cubic root of 61775797 is about 395.3115034642.

The spelling of 61775797 in words is "sixty-one million, seven hundred seventy-five thousand, seven hundred ninety-seven".