61549541 has 4 divisors (see below), whose sum is σ = 64225632. Its totient is φ = 58873452.

The previous prime is 61549519. The next prime is 61549591. The reversal of 61549541 is 14594516.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61549541 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 (61549591) 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, 1338011 + ... + 1338056.

It is an arithmetic number, because the mean of its divisors is an integer number (16056408).

Almost surely, 2^61549541 is an apocalyptic number.

It is an amenable number.

61549541 is a deficient number, since it is larger than the sum of its proper divisors (2676091).

61549541 is a wasteful number, since it uses less digits than its factorization.

61549541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676090.

The product of its digits is 21600, while the sum is 35.

The square root of 61549541 is about 7845.3515536272. The cubic root of 61549541 is about 394.8282990329.

The spelling of 61549541 in words is "sixty-one million, five hundred forty-nine thousand, five hundred forty-one".