961443139 has 16 divisors (see below), whose sum is σ = 996218496. Its totient is φ = 927360000.

The previous prime is 961443137. The next prime is 961443157. The reversal of 961443139 is 931344169.

It is a cyclic number.

It is not a de Polignac number, because 961443139 - 2¹ = 961443137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (961443137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1599439 + ... + 1600039.

It is an arithmetic number, because the mean of its divisors is an integer number (62263656).

Almost surely, 2^961443139 is an apocalyptic number.

961443139 is a deficient number, since it is larger than the sum of its proper divisors (34775357).

961443139 is a wasteful number, since it uses less digits than its factorization.

961443139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086.

The product of its digits is 69984, while the sum is 40.

The square root of 961443139 is about 31007.1465794581. The cubic root of 961443139 is about 986.9788998561.

The spelling of 961443139 in words is "nine hundred sixty-one million, four hundred forty-three thousand, one hundred thirty-nine".