87542431 has 2 divisors, whose sum is σ = 87542432. Its totient is φ = 87542430.

The previous prime is 87542383. The next prime is 87542449. The reversal of 87542431 is 13424578.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87542431 - 2⁷ = 87542303 is a prime.

It is a super-2 number, since 2×87542431² = 15327354450779522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87542471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43771215 + 43771216.

It is an arithmetic number, because the mean of its divisors is an integer number (43771216).

Almost surely, 2^87542431 is an apocalyptic number.

87542431 is a deficient number, since it is larger than the sum of its proper divisors (1).

87542431 is an equidigital number, since it uses as much as digits as its factorization.

87542431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 34.

The square root of 87542431 is about 9356.4112243958. The cubic root of 87542431 is about 444.0237505218.

The spelling of 87542431 in words is "eighty-seven million, five hundred forty-two thousand, four hundred thirty-one".