61356543 has 4 divisors (see below), whose sum is σ = 81808728. Its totient is φ = 40904360.

The previous prime is 61356539. The next prime is 61356551. The reversal of 61356543 is 34565316.

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 61356543 - 2² = 61356539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61356593) 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, 10226088 + ... + 10226093.

It is an arithmetic number, because the mean of its divisors is an integer number (20452182).

Almost surely, 2^61356543 is an apocalyptic number.

61356543 is a deficient number, since it is larger than the sum of its proper divisors (20452185).

61356543 is a wasteful number, since it uses less digits than its factorization.

61356543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20452184.

The product of its digits is 32400, while the sum is 33.

The square root of 61356543 is about 7833.0417463461. The cubic root of 61356543 is about 394.4151854306.

The spelling of 61356543 in words is "sixty-one million, three hundred fifty-six thousand, five hundred forty-three".