61091543 has 4 divisors (see below), whose sum is σ = 61662600. Its totient is φ = 60520488.

The previous prime is 61091533. The next prime is 61091579. The reversal of 61091543 is 34519016.

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 61091543 - 2⁸ = 61091287 is a prime.

It is a super-2 number, since 2×61091543² = 7464353252241698, 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 (61091533) 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, 285368 + ... + 285581.

It is an arithmetic number, because the mean of its divisors is an integer number (15415650).

Almost surely, 2^61091543 is an apocalyptic number.

61091543 is a deficient number, since it is larger than the sum of its proper divisors (571057).

61091543 is a wasteful number, since it uses less digits than its factorization.

61091543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571056.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 61091543 is about 7816.1079189070. The cubic root of 61091543 is about 393.8465372434.

The spelling of 61091543 in words is "sixty-one million, ninety-one thousand, five hundred forty-three".