87869381 has 2 divisors, whose sum is σ = 87869382. Its totient is φ = 87869380.

The previous prime is 87869371. The next prime is 87869399. The reversal of 87869381 is 18396878.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80389156 + 7480225 = 8966^2 + 2735^2 .

It is a cyclic number.

It is not a de Polignac number, because 87869381 - 2¹⁰ = 87868357 is a prime.

It is a super-2 number, since 2×87869381² = 15442056234646322, 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 (87869321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43934690 + 43934691.

It is an arithmetic number, because the mean of its divisors is an integer number (43934691).

Almost surely, 2^87869381 is an apocalyptic number.

It is an amenable number.

87869381 is a deficient number, since it is larger than the sum of its proper divisors (1).

87869381 is an equidigital number, since it uses as much as digits as its factorization.

87869381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 50.

The square root of 87869381 is about 9373.8669181934. The cubic root of 87869381 is about 444.5758378854.

The spelling of 87869381 in words is "eighty-seven million, eight hundred sixty-nine thousand, three hundred eighty-one".