87278101 has 2 divisors, whose sum is σ = 87278102. Its totient is φ = 87278100.

The previous prime is 87278011. The next prime is 87278131. The reversal of 87278101 is 10187278.

Together with previous prime (87278011) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85655025 + 1623076 = 9255^2 + 1274^2 .

It is a cyclic number.

It is not a de Polignac number, because 87278101 - 2⁷ = 87277973 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87278131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43639050 + 43639051.

It is an arithmetic number, because the mean of its divisors is an integer number (43639051).

Almost surely, 2^87278101 is an apocalyptic number.

It is an amenable number.

87278101 is a deficient number, since it is larger than the sum of its proper divisors (1).

87278101 is an equidigital number, since it uses as much as digits as its factorization.

87278101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 87278101 is about 9342.2749370804. The cubic root of 87278101 is about 443.5763974500.

The spelling of 87278101 in words is "eighty-seven million, two hundred seventy-eight thousand, one hundred one".