87781201 has 2 divisors, whose sum is σ = 87781202. Its totient is φ = 87781200.

The previous prime is 87781157. The next prime is 87781237. The reversal of 87781201 is 10218778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73942801 + 13838400 = 8599^2 + 3720^2 .

It is a cyclic number.

It is not a de Polignac number, because 87781201 - 2⁹ = 87780689 is a prime.

It is not a weakly prime, because it can be changed into another prime (87781301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43890600 + 43890601.

It is an arithmetic number, because the mean of its divisors is an integer number (43890601).

Almost surely, 2^87781201 is an apocalyptic number.

It is an amenable number.

87781201 is a deficient number, since it is larger than the sum of its proper divisors (1).

87781201 is an equidigital number, since it uses as much as digits as its factorization.

87781201 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 87781201 is about 9369.1622357605. The cubic root of 87781201 is about 444.4270723048.

Adding to 87781201 its reverse (10218778), we get a palindrome (97999979).

The spelling of 87781201 in words is "eighty-seven million, seven hundred eighty-one thousand, two hundred one".