245236639 has 2 divisors, whose sum is σ = 245236640. Its totient is φ = 245236638.

The previous prime is 245236633. The next prime is 245236699. The reversal of 245236639 is 936632542.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 245236639 - 2³ = 245236631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245236631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122618319 + 122618320.

It is an arithmetic number, because the mean of its divisors is an integer number (122618320).

Almost surely, 2^245236639 is an apocalyptic number.

245236639 is a deficient number, since it is larger than the sum of its proper divisors (1).

245236639 is an equidigital number, since it uses as much as digits as its factorization.

245236639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 40.

The square root of 245236639 is about 15660.0331736558. The cubic root of 245236639 is about 625.9338692063.

The spelling of 245236639 in words is "two hundred forty-five million, two hundred thirty-six thousand, six hundred thirty-nine".