65279989 has 2 divisors, whose sum is σ = 65279990. Its totient is φ = 65279988.

The previous prime is 65279971. The next prime is 65279999. The reversal of 65279989 is 98997256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61496964 + 3783025 = 7842^2 + 1945^2 .

It is a cyclic number.

It is not a de Polignac number, because 65279989 - 2⁷ = 65279861 is a prime.

It is a super-2 number, since 2×65279989² = 8522953927680242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65279959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32639994 + 32639995.

It is an arithmetic number, because the mean of its divisors is an integer number (32639995).

Almost surely, 2^65279989 is an apocalyptic number.

It is an amenable number.

65279989 is a deficient number, since it is larger than the sum of its proper divisors (1).

65279989 is an equidigital number, since it uses as much as digits as its factorization.

65279989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 55.

The square root of 65279989 is about 8079.6032699632. The cubic root of 65279989 is about 402.6490612079.

The spelling of 65279989 in words is "sixty-five million, two hundred seventy-nine thousand, nine hundred eighty-nine".