61604791 has 4 divisors (see below), whose sum is σ = 62649000. Its totient is φ = 60560584.

The previous prime is 61604789. The next prime is 61604801. The reversal of 61604791 is 19740616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61604791 - 2¹ = 61604789 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 (61604701) 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, 522016 + ... + 522133.

It is an arithmetic number, because the mean of its divisors is an integer number (15662250).

Almost surely, 2^61604791 is an apocalyptic number.

61604791 is a deficient number, since it is larger than the sum of its proper divisors (1044209).

61604791 is a wasteful number, since it uses less digits than its factorization.

61604791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044208.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 61604791 is about 7848.8719571668. The cubic root of 61604791 is about 394.9464030253.

The spelling of 61604791 in words is "sixty-one million, six hundred four thousand, seven hundred ninety-one".