61087121 has 2 divisors, whose sum is σ = 61087122. Its totient is φ = 61087120.

The previous prime is 61087099. The next prime is 61087141. The reversal of 61087121 is 12178016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33640000 + 27447121 = 5800^2 + 5239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61087121 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61087141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30543560 + 30543561.

It is an arithmetic number, because the mean of its divisors is an integer number (30543561).

Almost surely, 2^61087121 is an apocalyptic number.

It is an amenable number.

61087121 is a deficient number, since it is larger than the sum of its proper divisors (1).

61087121 is an equidigital number, since it uses as much as digits as its factorization.

61087121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 61087121 is about 7815.8250364245. The cubic root of 61087121 is about 393.8370343928.

The spelling of 61087121 in words is "sixty-one million, eighty-seven thousand, one hundred twenty-one".