61505131 has 2 divisors, whose sum is σ = 61505132. Its totient is φ = 61505130.

The previous prime is 61505113. The next prime is 61505149. The reversal of 61505131 is 13150516.

Together with previous prime (61505113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (61505113) and next prime (61505149).

It is a cyclic number.

It is not a de Polignac number, because 61505131 - 2¹⁵ = 61472363 is a prime.

It is a super-2 number, since 2×61505131² = 7565762278654322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61505161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30752565 + 30752566.

It is an arithmetic number, because the mean of its divisors is an integer number (30752566).

Almost surely, 2^61505131 is an apocalyptic number.

61505131 is a deficient number, since it is larger than the sum of its proper divisors (1).

61505131 is an equidigital number, since it uses as much as digits as its factorization.

61505131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 61505131 is about 7842.5207044674. The cubic root of 61505131 is about 394.7333156890.

Adding to 61505131 its reverse (13150516), we get a palindrome (74655647).

The spelling of 61505131 in words is "sixty-one million, five hundred five thousand, one hundred thirty-one".