961311990 has 16 divisors (see below), whose sum is σ = 2307148848. Its totient is φ = 256349856.

The previous prime is 961311983. The next prime is 961311997. The reversal of 961311990 is 99113169.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (961311983) and next prime (961311997).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961311997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16021837 + ... + 16021896.

It is an arithmetic number, because the mean of its divisors is an integer number (144196803).

Almost surely, 2^961311990 is an apocalyptic number.

961311990 is an abundant number, since it is smaller than the sum of its proper divisors (1345836858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

961311990 is a wasteful number, since it uses less digits than its factorization.

961311990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32043743.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 961311990 is about 31005.0316884212. The cubic root of 961311990 is about 986.9340203839.

The spelling of 961311990 in words is "nine hundred sixty-one million, three hundred eleven thousand, nine hundred ninety".