61274729 has 2 divisors, whose sum is σ = 61274730. Its totient is φ = 61274728.

The previous prime is 61274723. The next prime is 61274747. The reversal of 61274729 is 92747216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60031504 + 1243225 = 7748^2 + 1115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61274729 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61274692 and 61274701.

It is not a weakly prime, because it can be changed into another prime (61274723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30637364 + 30637365.

It is an arithmetic number, because the mean of its divisors is an integer number (30637365).

Almost surely, 2^61274729 is an apocalyptic number.

It is an amenable number.

61274729 is a deficient number, since it is larger than the sum of its proper divisors (1).

61274729 is an equidigital number, since it uses as much as digits as its factorization.

61274729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 38.

The square root of 61274729 is about 7827.8176396745. The cubic root of 61274729 is about 394.2398005105.

The spelling of 61274729 in words is "sixty-one million, two hundred seventy-four thousand, seven hundred twenty-nine".