961215439 has 4 divisors (see below), whose sum is σ = 984659760. Its totient is φ = 937771120.

The previous prime is 961215413. The next prime is 961215449. The reversal of 961215439 is 934512169.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934512169 = 19 ⋅49184851.

It is a cyclic number.

It is not a de Polignac number, because 961215439 - 2⁵ = 961215407 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961215449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11722099 + ... + 11722180.

It is an arithmetic number, because the mean of its divisors is an integer number (246164940).

Almost surely, 2^961215439 is an apocalyptic number.

961215439 is a deficient number, since it is larger than the sum of its proper divisors (23444321).

961215439 is a wasteful number, since it uses less digits than its factorization.

961215439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23444320.

The product of its digits is 58320, while the sum is 40.

The square root of 961215439 is about 31003.4746278542. The cubic root of 961215439 is about 986.9009778136.

The spelling of 961215439 in words is "nine hundred sixty-one million, two hundred fifteen thousand, four hundred thirty-nine".