61550297 has 2 divisors, whose sum is σ = 61550298. Its totient is φ = 61550296.

The previous prime is 61550273. The next prime is 61550299. The reversal of 61550297 is 79205516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60155536 + 1394761 = 7756^2 + 1181^2 .

It is a cyclic number.

It is not a de Polignac number, because 61550297 - 2⁶ = 61550233 is a prime.

Together with 61550299, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61550299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30775148 + 30775149.

It is an arithmetic number, because the mean of its divisors is an integer number (30775149).

Almost surely, 2^61550297 is an apocalyptic number.

It is an amenable number.

61550297 is a deficient number, since it is larger than the sum of its proper divisors (1).

61550297 is an equidigital number, since it uses as much as digits as its factorization.

61550297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 61550297 is about 7845.3997348765. The cubic root of 61550297 is about 394.8299155571.

The spelling of 61550297 in words is "sixty-one million, five hundred fifty thousand, two hundred ninety-seven".