61271631 has 12 divisors (see below), whose sum is σ = 89099400. Its totient is φ = 40572720.

The previous prime is 61271629. The next prime is 61271641. The reversal of 61271631 is 13617216.

61271631 is a `hidden beast` number, since 6 + 1 + 27 + 1 + 631 = 666.

It is not a de Polignac number, because 61271631 - 2¹ = 61271629 is a prime.

It is a super-2 number, since 2×61271631² = 7508425530800322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61271595 and 61271604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61271641) 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 11 ways as a sum of consecutive naturals, for example, 21505 + ... + 24186.

It is an arithmetic number, because the mean of its divisors is an integer number (7424950).

Almost surely, 2^61271631 is an apocalyptic number.

61271631 is a deficient number, since it is larger than the sum of its proper divisors (27827769).

61271631 is a wasteful number, since it uses less digits than its factorization.

61271631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45846 (or 45843 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 61271631 is about 7827.6197531561. The cubic root of 61271631 is about 394.2331562516.

Adding to 61271631 its reverse (13617216), we get a palindrome (74888847).

The spelling of 61271631 in words is "sixty-one million, two hundred seventy-one thousand, six hundred thirty-one".