101781871061 has 4 divisors (see below), whose sum is σ = 109611245772. Its totient is φ = 93952496352.

The previous prime is 101781871013. The next prime is 101781871067. The reversal of 101781871061 is 160178187101.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26689430161 + 75092440900 = 163369^2 + 274030^2 .

It is not a de Polignac number, because 101781871061 - 2²² = 101777676757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101781871067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3914687336 + ... + 3914687361.

It is an arithmetic number, because the mean of its divisors is an integer number (27402811443).

Almost surely, 2^101781871061 is an apocalyptic number.

It is an amenable number.

101781871061 is a deficient number, since it is larger than the sum of its proper divisors (7829374711).

101781871061 is an equidigital number, since it uses as much as digits as its factorization.

101781871061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7829374710.

The product of its (nonzero) digits is 18816, while the sum is 41.

The spelling of 101781871061 in words is "one hundred one billion, seven hundred eighty-one million, eight hundred seventy-one thousand, sixty-one".