961447993 has 4 divisors (see below), whose sum is σ = 1048852368. Its totient is φ = 874043620.

The previous prime is 961447973. The next prime is 961447999. The reversal of 961447993 is 399744169.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 399744169 = 11 ⋅36340379.

It is a cyclic number.

It is not a de Polignac number, because 961447993 - 2⁵ = 961447961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 961447993.

It is not an unprimeable number, because it can be changed into a prime (961447999) 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, 43702171 + ... + 43702192.

It is an arithmetic number, because the mean of its divisors is an integer number (262213092).

Almost surely, 2^961447993 is an apocalyptic number.

It is an amenable number.

961447993 is a deficient number, since it is larger than the sum of its proper divisors (87404375).

961447993 is a wasteful number, since it uses less digits than its factorization.

961447993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87404374.

The product of its digits is 1469664, while the sum is 52.

The square root of 961447993 is about 31007.2248516374. The cubic root of 961447993 is about 986.9805608271.

The spelling of 961447993 in words is "nine hundred sixty-one million, four hundred forty-seven thousand, nine hundred ninety-three".