961567639 has 2 divisors, whose sum is σ = 961567640. Its totient is φ = 961567638.

The previous prime is 961567631. The next prime is 961567661. The reversal of 961567639 is 936765169.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 961567639 - 2³ = 961567631 is a prime.

It is a super-2 number, since 2×961567639² = 1849224648744068642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961567631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480783819 + 480783820.

It is an arithmetic number, because the mean of its divisors is an integer number (480783820).

Almost surely, 2^961567639 is an apocalyptic number.

961567639 is a deficient number, since it is larger than the sum of its proper divisors (1).

961567639 is an equidigital number, since it uses as much as digits as its factorization.

961567639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1837080, while the sum is 52.

The square root of 961567639 is about 31009.1541161638. The cubic root of 961567639 is about 987.0215002500.

The spelling of 961567639 in words is "nine hundred sixty-one million, five hundred sixty-seven thousand, six hundred thirty-nine".