961999001 has 8 divisors (see below), whose sum is σ = 992322120. Its totient is φ = 931903488.

The previous prime is 961998997. The next prime is 961999039. The reversal of 961999001 is 100999169.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 470933401 + 491065600 = 21701^2 + 22160^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 961999001 - 2² = 961998997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (961999061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48296 + ... + 65241.

It is an arithmetic number, because the mean of its divisors is an integer number (124040265).

Almost surely, 2^961999001 is an apocalyptic number.

It is an amenable number.

961999001 is a deficient number, since it is larger than the sum of its proper divisors (30323119).

961999001 is a wasteful number, since it uses less digits than its factorization.

961999001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113803.

The product of its (nonzero) digits is 39366, while the sum is 44.

The square root of 961999001 is about 31016.1087340111. The cubic root of 961999001 is about 987.1690717436.

The spelling of 961999001 in words is "nine hundred sixty-one million, nine hundred ninety-nine thousand, one".