87291797 has 2 divisors, whose sum is σ = 87291798. Its totient is φ = 87291796.

The previous prime is 87291781. The next prime is 87291803. The reversal of 87291797 is 79719278.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43744996 + 43546801 = 6614^2 + 6599^2 .

It is a cyclic number.

It is not a de Polignac number, because 87291797 - 2⁴ = 87291781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87291727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43645898 + 43645899.

It is an arithmetic number, because the mean of its divisors is an integer number (43645899).

Almost surely, 2^87291797 is an apocalyptic number.

It is an amenable number.

87291797 is a deficient number, since it is larger than the sum of its proper divisors (1).

87291797 is an equidigital number, since it uses as much as digits as its factorization.

87291797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 50.

The square root of 87291797 is about 9343.0079203648. The cubic root of 87291797 is about 443.5995987820.

It can be divided in two parts, 87291 and 797, that added together give a palindrome (88088).

The spelling of 87291797 in words is "eighty-seven million, two hundred ninety-one thousand, seven hundred ninety-seven".