61415439 has 4 divisors (see below), whose sum is σ = 81887256. Its totient is φ = 40943624.

The previous prime is 61415413. The next prime is 61415443. The reversal of 61415439 is 93451416.

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 61415439 - 2¹⁶ = 61349903 is a prime.

It is a super-2 number, since 2×61415439² = 7543712295125442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61410439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10235904 + ... + 10235909.

It is an arithmetic number, because the mean of its divisors is an integer number (20471814).

Almost surely, 2^61415439 is an apocalyptic number.

61415439 is a deficient number, since it is larger than the sum of its proper divisors (20471817).

61415439 is a wasteful number, since it uses less digits than its factorization.

61415439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20471816.

The product of its digits is 12960, while the sum is 33.

The square root of 61415439 is about 7836.8003036954. The cubic root of 61415439 is about 394.5413444728.

The spelling of 61415439 in words is "sixty-one million, four hundred fifteen thousand, four hundred thirty-nine".