87781011131 has 8 divisors (see below), whose sum is σ = 95764076544. Its totient is φ = 79798441320.

The previous prime is 87781011127. The next prime is 87781011139. The reversal of 87781011131 is 13111018778.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87781011131 - 2² = 87781011127 is a prime.

It is a super-2 number, since 2×87781011131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87781011139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313646 + ... + 523388.

It is an arithmetic number, because the mean of its divisors is an integer number (11970509568).

Almost surely, 2^87781011131 is an apocalyptic number.

87781011131 is a deficient number, since it is larger than the sum of its proper divisors (7983065413).

87781011131 is a wasteful number, since it uses less digits than its factorization.

87781011131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247801.

The product of its (nonzero) digits is 9408, while the sum is 38.

The spelling of 87781011131 in words is "eighty-seven billion, seven hundred eighty-one million, eleven thousand, one hundred thirty-one".