61549983 has 16 divisors (see below), whose sum is σ = 99475200. Its totient is φ = 37302840.

The previous prime is 61549967. The next prime is 61550033. The reversal of 61549983 is 38994516.

It is a happy number.

It is not a de Polignac number, because 61549983 - 2⁴ = 61549967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61549913) 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 15 ways as a sum of consecutive naturals, for example, 103323 + ... + 103916.

It is an arithmetic number, because the mean of its divisors is an integer number (6217200).

Almost surely, 2^61549983 is an apocalyptic number.

61549983 is a deficient number, since it is larger than the sum of its proper divisors (37925217).

61549983 is a wasteful number, since it uses less digits than its factorization.

61549983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207259 (or 207253 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 61549983 is about 7845.3797231237. The cubic root of 61549983 is about 394.8292441452.

The spelling of 61549983 in words is "sixty-one million, five hundred forty-nine thousand, nine hundred eighty-three".