61423559 has 4 divisors (see below), whose sum is σ = 61446000. Its totient is φ = 61401120.

The previous prime is 61423541. The next prime is 61423573. The reversal of 61423559 is 95532416.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61423559 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 (61423519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6434 + ... + 12815.

It is an arithmetic number, because the mean of its divisors is an integer number (15361500).

Almost surely, 2^61423559 is an apocalyptic number.

61423559 is a deficient number, since it is larger than the sum of its proper divisors (22441).

61423559 is a wasteful number, since it uses less digits than its factorization.

61423559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22440.

The product of its digits is 32400, while the sum is 35.

The square root of 61423559 is about 7837.3183551518. The cubic root of 61423559 is about 394.5587317106.

The spelling of 61423559 in words is "sixty-one million, four hundred twenty-three thousand, five hundred fifty-nine".