61747121 has 2 divisors, whose sum is σ = 61747122. Its totient is φ = 61747120.

The previous prime is 61747087. The next prime is 61747141. The reversal of 61747121 is 12174716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58736896 + 3010225 = 7664^2 + 1735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61747121 is a prime.

It is a super-5 number, since 5×61747121⁵ (a number of 40 digits) contains 55555 as substring.

It is not a weakly prime, because it can be changed into another prime (61747141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30873560 + 30873561.

It is an arithmetic number, because the mean of its divisors is an integer number (30873561).

Almost surely, 2^61747121 is an apocalyptic number.

It is an amenable number.

61747121 is a deficient number, since it is larger than the sum of its proper divisors (1).

61747121 is an equidigital number, since it uses as much as digits as its factorization.

61747121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 29.

The square root of 61747121 is about 7857.9336342323. The cubic root of 61747121 is about 395.2503268238.

The spelling of 61747121 in words is "sixty-one million, seven hundred forty-seven thousand, one hundred twenty-one".