87445381 has 2 divisors, whose sum is σ = 87445382. Its totient is φ = 87445380.

The previous prime is 87445367. The next prime is 87445387. The reversal of 87445381 is 18354478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81613156 + 5832225 = 9034^2 + 2415^2 .

It is a cyclic number.

It is not a de Polignac number, because 87445381 - 2⁵ = 87445349 is a prime.

It is a super-2 number, since 2×87445381² = 15293389316470322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87445387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43722690 + 43722691.

It is an arithmetic number, because the mean of its divisors is an integer number (43722691).

Almost surely, 2^87445381 is an apocalyptic number.

It is an amenable number.

87445381 is a deficient number, since it is larger than the sum of its proper divisors (1).

87445381 is an equidigital number, since it uses as much as digits as its factorization.

87445381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 40.

The square root of 87445381 is about 9351.2235028364. The cubic root of 87445381 is about 443.8596074943.

The spelling of 87445381 in words is "eighty-seven million, four hundred forty-five thousand, three hundred eighty-one".