87172061 has 2 divisors, whose sum is σ = 87172062. Its totient is φ = 87172060.

The previous prime is 87172013. The next prime is 87172067. The reversal of 87172061 is 16027178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58216900 + 28955161 = 7630^2 + 5381^2 .

It is a cyclic number.

It is not a de Polignac number, because 87172061 - 2¹⁰ = 87171037 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87172067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43586030 + 43586031.

It is an arithmetic number, because the mean of its divisors is an integer number (43586031).

Almost surely, 2^87172061 is an apocalyptic number.

It is an amenable number.

87172061 is a deficient number, since it is larger than the sum of its proper divisors (1).

87172061 is an equidigital number, since it uses as much as digits as its factorization.

87172061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 87172061 is about 9336.5979350082. The cubic root of 87172061 is about 443.3966811068.

The spelling of 87172061 in words is "eighty-seven million, one hundred seventy-two thousand, sixty-one".