61539949 has 12 divisors (see below), whose sum is σ = 66291124. Its totient is φ = 57106944.

The previous prime is 61539941. The next prime is 61539953. The reversal of 61539949 is 94993516.

It can be written as a sum of positive squares in 6 ways, for example, as 25755625 + 35784324 = 5075^2 + 5982^2 .

It is not a de Polignac number, because 61539949 - 2³ = 61539941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61539899 and 61539908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61539941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19639 + ... + 22555.

Almost surely, 2^61539949 is an apocalyptic number.

It is an amenable number.

61539949 is a deficient number, since it is larger than the sum of its proper divisors (4751175).

61539949 is a wasteful number, since it uses less digits than its factorization.

61539949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3024 (or 3007 counting only the distinct ones).

The product of its digits is 262440, while the sum is 46.

The square root of 61539949 is about 7844.7402123971. The cubic root of 61539949 is about 394.8077876977.

The spelling of 61539949 in words is "sixty-one million, five hundred thirty-nine thousand, nine hundred forty-nine".