61279609 has 2 divisors, whose sum is σ = 61279610. Its totient is φ = 61279608.

The previous prime is 61279553. The next prime is 61279657. The reversal of 61279609 is 90697216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61277584 + 2025 = 7828^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 61279609 - 2¹⁵ = 61246841 is a prime.

It is not a weakly prime, because it can be changed into another prime (61279709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30639804 + 30639805.

It is an arithmetic number, because the mean of its divisors is an integer number (30639805).

Almost surely, 2^61279609 is an apocalyptic number.

It is an amenable number.

61279609 is a deficient number, since it is larger than the sum of its proper divisors (1).

61279609 is an equidigital number, since it uses as much as digits as its factorization.

61279609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 61279609 is about 7828.1293423142. The cubic root of 61279609 is about 394.2502661581.

The spelling of 61279609 in words is "sixty-one million, two hundred seventy-nine thousand, six hundred nine".