61509079 has 4 divisors (see below), whose sum is σ = 61585920. Its totient is φ = 61432240.

The previous prime is 61509073. The next prime is 61509089. The reversal of 61509079 is 97090516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61509079 - 2²¹ = 59411927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61509073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37207 + ... + 38824.

It is an arithmetic number, because the mean of its divisors is an integer number (15396480).

Almost surely, 2^61509079 is an apocalyptic number.

61509079 is a deficient number, since it is larger than the sum of its proper divisors (76841).

61509079 is an equidigital number, since it uses as much as digits as its factorization.

61509079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76840.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 61509079 is about 7842.7724052149. The cubic root of 61509079 is about 394.7417614548.

The spelling of 61509079 in words is "sixty-one million, five hundred nine thousand, seventy-nine".