87451439 has 2 divisors, whose sum is σ = 87451440. Its totient is φ = 87451438.

The previous prime is 87451411. The next prime is 87451447. The reversal of 87451439 is 93415478.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87451439 - 2²⁰ = 86402863 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87451396 and 87451405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87451409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43725719 + 43725720.

It is an arithmetic number, because the mean of its divisors is an integer number (43725720).

Almost surely, 2^87451439 is an apocalyptic number.

87451439 is a deficient number, since it is larger than the sum of its proper divisors (1).

87451439 is an equidigital number, since it uses as much as digits as its factorization.

87451439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 87451439 is about 9351.5474120597. The cubic root of 87451439 is about 443.8698570900.

The spelling of 87451439 in words is "eighty-seven million, four hundred fifty-one thousand, four hundred thirty-nine".