61516517 has 4 divisors (see below), whose sum is σ = 62677260. Its totient is φ = 60355776.

The previous prime is 61516501. The next prime is 61516549. The reversal of 61516517 is 71561516.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16008001 + 45508516 = 4001^2 + 6746^2 .

It is a cyclic number.

It is not a de Polignac number, because 61516517 - 2⁴ = 61516501 is a prime.

It is a super-2 number, since 2×61516517² = 7568563727622578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61516717) 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, 580292 + ... + 580397.

It is an arithmetic number, because the mean of its divisors is an integer number (15669315).

Almost surely, 2^61516517 is an apocalyptic number.

It is an amenable number.

61516517 is a deficient number, since it is larger than the sum of its proper divisors (1160743).

61516517 is a wasteful number, since it uses less digits than its factorization.

61516517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160742.

The product of its digits is 6300, while the sum is 32.

The square root of 61516517 is about 7843.2465854390. The cubic root of 61516517 is about 394.7576722273.

The spelling of 61516517 in words is "sixty-one million, five hundred sixteen thousand, five hundred seventeen".