61258709 has 2 divisors, whose sum is σ = 61258710. Its totient is φ = 61258708.

The previous prime is 61258669. The next prime is 61258721. The reversal of 61258709 is 90785216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32604100 + 28654609 = 5710^2 + 5353^2 .

It is a cyclic number.

It is not a de Polignac number, because 61258709 - 2²⁰ = 60210133 is a prime.

It is a Chen prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61258739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30629354 + 30629355.

It is an arithmetic number, because the mean of its divisors is an integer number (30629355).

Almost surely, 2^61258709 is an apocalyptic number.

It is an amenable number.

61258709 is a deficient number, since it is larger than the sum of its proper divisors (1).

61258709 is an equidigital number, since it uses as much as digits as its factorization.

61258709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 61258709 is about 7826.7942990729. The cubic root of 61258709 is about 394.2054401133.

The spelling of 61258709 in words is "sixty-one million, two hundred fifty-eight thousand, seven hundred nine".