61771031 has 16 divisors (see below), whose sum is σ = 73903104. Its totient is φ = 50481024.

The previous prime is 61771027. The next prime is 61771037. The reversal of 61771031 is 13017716.

It is a cyclic number.

It is not a de Polignac number, because 61771031 - 2² = 61771027 is a prime.

It is a super-2 number, since 2×61771031² = 7631320541605922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61771037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95150 + ... + 95796.

It is an arithmetic number, because the mean of its divisors is an integer number (4618944).

Almost surely, 2^61771031 is an apocalyptic number.

61771031 is a deficient number, since it is larger than the sum of its proper divisors (12132073).

61771031 is a wasteful number, since it uses less digits than its factorization.

61771031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270.

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 61771031 is about 7859.4548793157. The cubic root of 61771031 is about 395.3013371144.

Adding to 61771031 its reverse (13017716), we get a palindrome (74788747).

The spelling of 61771031 in words is "sixty-one million, seven hundred seventy-one thousand, thirty-one".