87938129 has 2 divisors, whose sum is σ = 87938130. Its totient is φ = 87938128.

The previous prime is 87938117. The next prime is 87938171. The reversal of 87938129 is 92183978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87928129 + 10000 = 9377^2 + 100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87938129 is a prime.

It is a super-2 number, since 2×87938129² = 15466229064041282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87938189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43969064 + 43969065.

It is an arithmetic number, because the mean of its divisors is an integer number (43969065).

Almost surely, 2^87938129 is an apocalyptic number.

It is an amenable number.

87938129 is a deficient number, since it is larger than the sum of its proper divisors (1).

87938129 is an equidigital number, since it uses as much as digits as its factorization.

87938129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 87938129 is about 9377.5332044200. The cubic root of 87938129 is about 444.6917513467.

The spelling of 87938129 in words is "eighty-seven million, nine hundred thirty-eight thousand, one hundred twenty-nine".