87261131 has 4 divisors (see below), whose sum is σ = 87512952. Its totient is φ = 87009312.

The previous prime is 87261121. The next prime is 87261143. The reversal of 87261131 is 13116278.

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 87261131 - 2⁶ = 87261067 is a prime.

It is a super-2 number, since 2×87261131² = 15229009966798322, 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 = 87261094 and 87261103.

It is not an unprimeable number, because it can be changed into a prime (87261101) 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, 125390 + ... + 126083.

It is an arithmetic number, because the mean of its divisors is an integer number (21878238).

Almost surely, 2^87261131 is an apocalyptic number.

87261131 is a deficient number, since it is larger than the sum of its proper divisors (251821).

87261131 is a wasteful number, since it uses less digits than its factorization.

87261131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251820.

The product of its digits is 2016, while the sum is 29.

The square root of 87261131 is about 9341.3666559021. The cubic root of 87261131 is about 443.5476465212.

The spelling of 87261131 in words is "eighty-seven million, two hundred sixty-one thousand, one hundred thirty-one".