245699989 has 2 divisors, whose sum is σ = 245699990. Its totient is φ = 245699988.

The previous prime is 245699983. The next prime is 245699999. The reversal of 245699989 is 989996542.

It is a happy number.

245699989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194463025 + 51236964 = 13945^2 + 7158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245699989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245699983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122849994 + 122849995.

It is an arithmetic number, because the mean of its divisors is an integer number (122849995).

Almost surely, 2^245699989 is an apocalyptic number.

It is an amenable number.

245699989 is a deficient number, since it is larger than the sum of its proper divisors (1).

245699989 is an equidigital number, since it uses as much as digits as its factorization.

245699989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12597120, while the sum is 61.

The square root of 245699989 is about 15674.8202222545. The cubic root of 245699989 is about 626.3278342521.

The spelling of 245699989 in words is "two hundred forty-five million, six hundred ninety-nine thousand, nine hundred eighty-nine".