61223539 has 16 divisors (see below), whose sum is σ = 69656832. Its totient is φ = 53383968.

The previous prime is 61223531. The next prime is 61223551. The reversal of 61223539 is 93532216.

It is a cyclic number.

It is not a de Polignac number, because 61223539 - 2³ = 61223531 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61223539.

It is not an unprimeable number, because it can be changed into a prime (61223531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23584 + ... + 26050.

It is an arithmetic number, because the mean of its divisors is an integer number (4353552).

Almost surely, 2^61223539 is an apocalyptic number.

61223539 is a deficient number, since it is larger than the sum of its proper divisors (8433293).

61223539 is a wasteful number, since it uses less digits than its factorization.

61223539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586.

The product of its digits is 9720, while the sum is 31.

The square root of 61223539 is about 7824.5472073469. The cubic root of 61223539 is about 394.1299849404.

The spelling of 61223539 in words is "sixty-one million, two hundred twenty-three thousand, five hundred thirty-nine".