61506543 has 16 divisors (see below), whose sum is σ = 96258560. Its totient is φ = 34196256.

The previous prime is 61506539. The next prime is 61506547. The reversal of 61506543 is 34560516.

It is an interprime number because it is at equal distance from previous prime (61506539) and next prime (61506547).

It is not a de Polignac number, because 61506543 - 2² = 61506539 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 61506543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61506547) 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, 38803 + ... + 40356.

It is an arithmetic number, because the mean of its divisors is an integer number (6016160).

Almost surely, 2^61506543 is an apocalyptic number.

61506543 is a deficient number, since it is larger than the sum of its proper divisors (34752017).

61506543 is a wasteful number, since it uses less digits than its factorization.

61506543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79206.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 61506543 is about 7842.6107260274. The cubic root of 61506543 is about 394.7363363540.

The spelling of 61506543 in words is "sixty-one million, five hundred six thousand, five hundred forty-three".