61156543 has 16 divisors (see below), whose sum is σ = 71910720. Its totient is φ = 50918400.

The previous prime is 61156477. The next prime is 61156561. The reversal of 61156543 is 34565116.

It is a cyclic number.

It is not a de Polignac number, because 61156543 - 2⁹ = 61156031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61156643) 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, 117123 + ... + 117643.

It is an arithmetic number, because the mean of its divisors is an integer number (4494420).

Almost surely, 2^61156543 is an apocalyptic number.

61156543 is a deficient number, since it is larger than the sum of its proper divisors (10754177).

61156543 is a wasteful number, since it uses less digits than its factorization.

61156543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978.

The product of its digits is 10800, while the sum is 31.

The square root of 61156543 is about 7820.2648932117. The cubic root of 61156543 is about 393.9861689597.

The spelling of 61156543 in words is "sixty-one million, one hundred fifty-six thousand, five hundred forty-three".