87429869 has 2 divisors, whose sum is σ = 87429870. Its totient is φ = 87429868.

The previous prime is 87429863. The next prime is 87429871. The reversal of 87429869 is 96892478.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52027369 + 35402500 = 7213^2 + 5950^2 .

It is a cyclic number.

It is not a de Polignac number, because 87429869 - 2¹² = 87425773 is a prime.

It is a super-2 number, since 2×87429869² = 15287963986714322, which contains 22 as substring.

Together with 87429871, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87429869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87429863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43714934 + 43714935.

It is an arithmetic number, because the mean of its divisors is an integer number (43714935).

Almost surely, 2^87429869 is an apocalyptic number.

It is an amenable number.

87429869 is a deficient number, since it is larger than the sum of its proper divisors (1).

87429869 is an equidigital number, since it uses as much as digits as its factorization.

87429869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 53.

The square root of 87429869 is about 9350.3940558674. The cubic root of 87429869 is about 443.8333604156.

The spelling of 87429869 in words is "eighty-seven million, four hundred twenty-nine thousand, eight hundred sixty-nine".