61897277 has 4 divisors (see below), whose sum is σ = 66658620. Its totient is φ = 57135936.

The previous prime is 61897273. The next prime is 61897309. The reversal of 61897277 is 77279816.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12630916 + 49266361 = 3554^2 + 7019^2 .

It is not a de Polignac number, because 61897277 - 2² = 61897273 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61897271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2380652 + ... + 2380677.

It is an arithmetic number, because the mean of its divisors is an integer number (16664655).

Almost surely, 2^61897277 is an apocalyptic number.

It is an amenable number.

61897277 is a deficient number, since it is larger than the sum of its proper divisors (4761343).

61897277 is a wasteful number, since it uses less digits than its factorization.

61897277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4761342.

The product of its digits is 296352, while the sum is 47.

The square root of 61897277 is about 7867.4822529193. The cubic root of 61897277 is about 395.5704559987.

The spelling of 61897277 in words is "sixty-one million, eight hundred ninety-seven thousand, two hundred seventy-seven".