61305131 has 2 divisors, whose sum is σ = 61305132. Its totient is φ = 61305130.

The previous prime is 61305121. The next prime is 61305149. The reversal of 61305131 is 13150316.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61305131 is a prime.

It is a super-2 number, since 2×61305131² = 7516638173854322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61305121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30652565 + 30652566.

It is an arithmetic number, because the mean of its divisors is an integer number (30652566).

Almost surely, 2^61305131 is an apocalyptic number.

61305131 is a deficient number, since it is larger than the sum of its proper divisors (1).

61305131 is an equidigital number, since it uses as much as digits as its factorization.

61305131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 61305131 is about 7829.7593194172. The cubic root of 61305131 is about 394.3049915873.

Adding to 61305131 its reverse (13150316), we get a palindrome (74455447).

The spelling of 61305131 in words is "sixty-one million, three hundred five thousand, one hundred thirty-one".