61171031 has 2 divisors, whose sum is σ = 61171032. Its totient is φ = 61171030.

The previous prime is 61171009. The next prime is 61171037. The reversal of 61171031 is 13017116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61171031 - 2¹⁴ = 61154647 is a prime.

It is a super-2 number, since 2×61171031² = 7483790067205922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61170994 and 61171012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61171037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30585515 + 30585516.

It is an arithmetic number, because the mean of its divisors is an integer number (30585516).

Almost surely, 2^61171031 is an apocalyptic number.

61171031 is a deficient number, since it is larger than the sum of its proper divisors (1).

61171031 is an equidigital number, since it uses as much as digits as its factorization.

61171031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 61171031 is about 7821.1911496907. The cubic root of 61171031 is about 394.0172783098.

Adding to 61171031 its reverse (13017116), we get a palindrome (74188147).

The spelling of 61171031 in words is "sixty-one million, one hundred seventy-one thousand, thirty-one".