61285709 has 4 divisors (see below), whose sum is σ = 62148960. Its totient is φ = 60422460.

The previous prime is 61285699. The next prime is 61285711. The reversal of 61285709 is 90758216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61285709 - 2⁸ = 61285453 is a prime.

It is a super-3 number, since 3×61285709³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61285739) 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, 431519 + ... + 431660.

It is an arithmetic number, because the mean of its divisors is an integer number (15537240).

Almost surely, 2^61285709 is an apocalyptic number.

It is an amenable number.

61285709 is a deficient number, since it is larger than the sum of its proper divisors (863251).

61285709 is an equidigital number, since it uses as much as digits as its factorization.

61285709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863250.

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

The square root of 61285709 is about 7828.5189531609. The cubic root of 61285709 is about 394.2633474362.

The spelling of 61285709 in words is "sixty-one million, two hundred eighty-five thousand, seven hundred nine".