61208909 has 4 divisors (see below), whose sum is σ = 62632416. Its totient is φ = 59785404.

The previous prime is 61208897. The next prime is 61208921. The reversal of 61208909 is 90980216.

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 an interprime number because it is at equal distance from previous prime (61208897) and next prime (61208921).

It is a cyclic number.

It is not a de Polignac number, because 61208909 - 2¹² = 61204813 is a prime.

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 (61208969) 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, 711689 + ... + 711774.

It is an arithmetic number, because the mean of its divisors is an integer number (15658104).

Almost surely, 2^61208909 is an apocalyptic number.

It is an amenable number.

61208909 is a deficient number, since it is larger than the sum of its proper divisors (1423507).

61208909 is a wasteful number, since it uses less digits than its factorization.

61208909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423506.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 61208909 is about 7823.6122731127. The cubic root of 61208909 is about 394.0985886228.

The spelling of 61208909 in words is "sixty-one million, two hundred eight thousand, nine hundred nine".