61331583 has 4 divisors (see below), whose sum is σ = 81775448. Its totient is φ = 40887720.

The previous prime is 61331573. The next prime is 61331587. The reversal of 61331583 is 38513316.

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

It is not a de Polignac number, because 61331583 - 2⁵ = 61331551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61331583.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61331587) 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, 10221928 + ... + 10221933.

It is an arithmetic number, because the mean of its divisors is an integer number (20443862).

Almost surely, 2^61331583 is an apocalyptic number.

61331583 is a deficient number, since it is larger than the sum of its proper divisors (20443865).

61331583 is a wasteful number, since it uses less digits than its factorization.

61331583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20443864.

The product of its digits is 6480, while the sum is 30.

The square root of 61331583 is about 7831.4483334821. The cubic root of 61331583 is about 394.3616951383.

Adding to 61331583 its reverse (38513316), we get a palindrome (99844899).

The spelling of 61331583 in words is "sixty-one million, three hundred thirty-one thousand, five hundred eighty-three".