86897869 has 2 divisors, whose sum is σ = 86897870. Its totient is φ = 86897868.

The previous prime is 86897857. The next prime is 86897879. The reversal of 86897869 is 96879868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46104100 + 40793769 = 6790^2 + 6387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86897869 is a prime.

It is a super-2 number, since 2×86897869² = 15102479273482322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86897879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43448934 + 43448935.

It is an arithmetic number, because the mean of its divisors is an integer number (43448935).

Almost surely, 2^86897869 is an apocalyptic number.

It is an amenable number.

86897869 is a deficient number, since it is larger than the sum of its proper divisors (1).

86897869 is an equidigital number, since it uses as much as digits as its factorization.

86897869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 61.

The square root of 86897869 is about 9321.9026491377. The cubic root of 86897869 is about 442.9313044970.

The spelling of 86897869 in words is "eighty-six million, eight hundred ninety-seven thousand, eight hundred sixty-nine".