87681131 has 4 divisors (see below), whose sum is σ = 87725232. Its totient is φ = 87637032.

The previous prime is 87681127. The next prime is 87681137. The reversal of 87681131 is 13118678.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13118678 = 2 ⋅6559339.

It is a cyclic number.

It is not a de Polignac number, because 87681131 - 2² = 87681127 is a prime.

It is a super-2 number, since 2×87681131² = 15375961466878322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87681091 and 87681100.

It is not an unprimeable number, because it can be changed into a prime (87681137) 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, 18920 + ... + 23093.

It is an arithmetic number, because the mean of its divisors is an integer number (21931308).

Almost surely, 2^87681131 is an apocalyptic number.

87681131 is a deficient number, since it is larger than the sum of its proper divisors (44101).

87681131 is a wasteful number, since it uses less digits than its factorization.

87681131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44100.

The product of its digits is 8064, while the sum is 35.

The square root of 87681131 is about 9363.8203207879. The cubic root of 87681131 is about 444.2581267626.

The spelling of 87681131 in words is "eighty-seven million, six hundred eighty-one thousand, one hundred thirty-one".