61543541 has 4 divisors (see below), whose sum is σ = 61559232. Its totient is φ = 61527852.

The previous prime is 61543499. The next prime is 61543567. The reversal of 61543541 is 14534516.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61543541 - 2⁶ = 61543477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61543591) 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, 3890 + ... + 11756.

It is an arithmetic number, because the mean of its divisors is an integer number (15389808).

Almost surely, 2^61543541 is an apocalyptic number.

It is an amenable number.

61543541 is a deficient number, since it is larger than the sum of its proper divisors (15691).

61543541 is an equidigital number, since it uses as much as digits as its factorization.

61543541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15690.

The product of its digits is 7200, while the sum is 29.

The square root of 61543541 is about 7844.9691522657. The cubic root of 61543541 is about 394.8154690061.

The spelling of 61543541 in words is "sixty-one million, five hundred forty-three thousand, five hundred forty-one".