61131583 has 2 divisors, whose sum is σ = 61131584. Its totient is φ = 61131582.

The previous prime is 61131559. The next prime is 61131589. The reversal of 61131583 is 38513116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61131583 - 2²¹ = 59034431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61131589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30565791 + 30565792.

It is an arithmetic number, because the mean of its divisors is an integer number (30565792).

Almost surely, 2^61131583 is an apocalyptic number.

61131583 is a deficient number, since it is larger than the sum of its proper divisors (1).

61131583 is an equidigital number, since it uses as much as digits as its factorization.

61131583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 61131583 is about 7818.6688764776. The cubic root of 61131583 is about 393.9325620877.

Adding to 61131583 its reverse (38513116), we get a palindrome (99644699).

The spelling of 61131583 in words is "sixty-one million, one hundred thirty-one thousand, five hundred eighty-three".