61771131 has 24 divisors (see below), whose sum is σ = 92720160. Its totient is φ = 39580800.

The previous prime is 61771121. The next prime is 61771141. The reversal of 61771131 is 13117716.

61771131 is a `hidden beast` number, since 617 + 7 + 11 + 31 = 666.

It is an interprime number because it is at equal distance from previous prime (61771121) and next prime (61771141).

It is not a de Polignac number, because 61771131 - 2⁹ = 61770619 is a prime.

It is a super-2 number, since 2×61771131² = 7631345250038322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61771095 and 61771104.

It is not an unprimeable number, because it can be changed into a prime (61771121) 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 in 23 ways as a sum of consecutive naturals, for example, 80791 + ... + 81551.

It is an arithmetic number, because the mean of its divisors is an integer number (3863340).

Almost surely, 2^61771131 is an apocalyptic number.

61771131 is a deficient number, since it is larger than the sum of its proper divisors (30949029).

61771131 is a wasteful number, since it uses less digits than its factorization.

61771131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107 (or 1104 counting only the distinct ones).

The product of its digits is 882, while the sum is 27.

The square root of 61771131 is about 7859.4612410775. The cubic root of 61771131 is about 395.3015504297.

Adding to 61771131 its reverse (13117716), we get a palindrome (74888847).

The spelling of 61771131 in words is "sixty-one million, seven hundred seventy-one thousand, one hundred thirty-one".