87404131 has 2 divisors, whose sum is σ = 87404132. Its totient is φ = 87404130.

The previous prime is 87404111. The next prime is 87404137. The reversal of 87404131 is 13140478.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87404131 - 2¹⁷ = 87273059 is a prime.

It is a super-2 number, since 2×87404131² = 15278964231730322, which contains 22 as substring.

It is equal to p_5075245 and since 87404131 and 5075245 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87404131.

It is not a weakly prime, because it can be changed into another prime (87404137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43702065 + 43702066.

It is an arithmetic number, because the mean of its divisors is an integer number (43702066).

Almost surely, 2^87404131 is an apocalyptic number.

87404131 is a deficient number, since it is larger than the sum of its proper divisors (1).

87404131 is an equidigital number, since it uses as much as digits as its factorization.

87404131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 87404131 is about 9349.0176489298. The cubic root of 87404131 is about 443.7898035842.

The spelling of 87404131 in words is "eighty-seven million, four hundred four thousand, one hundred thirty-one".