61585621 has 4 divisors (see below), whose sum is σ = 61622892. Its totient is φ = 61548352.

The previous prime is 61585619. The next prime is 61585633. The reversal of 61585621 is 12658516.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39627025 + 21958596 = 6295^2 + 4686^2 .

It is a cyclic number.

It is not a de Polignac number, because 61585621 - 2¹ = 61585619 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 (61585691) 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, 16036 + ... + 19501.

It is an arithmetic number, because the mean of its divisors is an integer number (15405723).

Almost surely, 2^61585621 is an apocalyptic number.

It is an amenable number.

61585621 is a deficient number, since it is larger than the sum of its proper divisors (37271).

61585621 is a wasteful number, since it uses less digits than its factorization.

61585621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37270.

The product of its digits is 14400, while the sum is 34.

The square root of 61585621 is about 7847.6506675565. The cubic root of 61585621 is about 394.9054326837.

The spelling of 61585621 in words is "sixty-one million, five hundred eighty-five thousand, six hundred twenty-one".