609967639 has 2 divisors, whose sum is σ = 609967640. Its totient is φ = 609967638.

The previous prime is 609967627. The next prime is 609967717. The reversal of 609967639 is 936769906.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 609967639 - 2²³ = 601579031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 609967639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (609967139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304983819 + 304983820.

It is an arithmetic number, because the mean of its divisors is an integer number (304983820).

Almost surely, 2^609967639 is an apocalyptic number.

609967639 is a deficient number, since it is larger than the sum of its proper divisors (1).

609967639 is an equidigital number, since it uses as much as digits as its factorization.

609967639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3306744, while the sum is 55.

The square root of 609967639 is about 24697.5229324724. The cubic root of 609967639 is about 848.0776112476.

It can be divided in two parts, 60996 and 7639, that added together give a triangular number (68635 = T₃₇₀).

The spelling of 609967639 in words is "six hundred nine million, nine hundred sixty-seven thousand, six hundred thirty-nine".