61771509031 has 2 divisors, whose sum is σ = 61771509032. Its totient is φ = 61771509030.

The previous prime is 61771509001. The next prime is 61771509053. The reversal of 61771509031 is 13090517716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61771509031 - 2¹¹ = 61771506983 is a prime.

It is a super-2 number, since 2×61771509031² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61771509001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30885754515 + 30885754516.

It is an arithmetic number, because the mean of its divisors is an integer number (30885754516).

Almost surely, 2^61771509031 is an apocalyptic number.

61771509031 is a deficient number, since it is larger than the sum of its proper divisors (1).

61771509031 is an equidigital number, since it uses as much as digits as its factorization.

61771509031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 40.

The spelling of 61771509031 in words is "sixty-one billion, seven hundred seventy-one million, five hundred nine thousand, thirty-one".