61771500031 has 4 divisors (see below), whose sum is σ = 61879681864. Its totient is φ = 61663318200.

The previous prime is 61771499987. The next prime is 61771500047. The reversal of 61771500031 is 13000517716.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61771500031 - 2⁷ = 61771499903 is a prime.

It is a super-2 number, since 2×61771500031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61771499966 and 61771500002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61771509031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54090060 + ... + 54091201.

It is an arithmetic number, because the mean of its divisors is an integer number (15469920466).

Almost surely, 2^61771500031 is an apocalyptic number.

61771500031 is a deficient number, since it is larger than the sum of its proper divisors (108181833).

61771500031 is a wasteful number, since it uses less digits than its factorization.

61771500031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108181832.

The product of its (nonzero) digits is 4410, while the sum is 31.

The spelling of 61771500031 in words is "sixty-one billion, seven hundred seventy-one million, five hundred thousand, thirty-one".