61605849 has 4 divisors (see below), whose sum is σ = 82141136. Its totient is φ = 41070564.

The previous prime is 61605839. The next prime is 61605857. The reversal of 61605849 is 94850616.

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 not a de Polignac number, because 61605849 - 2⁴ = 61605833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61605839) 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, 10267639 + ... + 10267644.

It is an arithmetic number, because the mean of its divisors is an integer number (20535284).

Almost surely, 2^61605849 is an apocalyptic number.

It is an amenable number.

61605849 is a deficient number, since it is larger than the sum of its proper divisors (20535287).

61605849 is a wasteful number, since it uses less digits than its factorization.

61605849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20535286.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 61605849 is about 7848.9393550976. The cubic root of 61605849 is about 394.9486639474.

The spelling of 61605849 in words is "sixty-one million, six hundred five thousand, eight hundred forty-nine".