1023899961 has 64 divisors (see below), whose sum is σ = 1672478720. Its totient is φ = 544864320.

The previous prime is 1023899887. The next prime is 1023899969. The reversal of 1023899961 is 1699983201.

It is not a de Polignac number, because 1023899961 - 2¹⁰ = 1023898937 is a prime.

It is a super-2 number, since 2×1023899961² = 2096742260271603042, which contains 22 as substring.

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 1023899961.

It is not an unprimeable number, because it can be changed into a prime (1023899969) 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 63 ways as a sum of consecutive naturals, for example, 2211216 + ... + 2211678.

It is an arithmetic number, because the mean of its divisors is an integer number (26132480).

Almost surely, 2^1023899961 is an apocalyptic number.

It is an amenable number.

1023899961 is a deficient number, since it is larger than the sum of its proper divisors (648578759).

1023899961 is a wasteful number, since it uses less digits than its factorization.

1023899961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 1023899961 is about 31998.4368524464. The cubic root of 1023899961 is about 1007.9040156069.

The spelling of 1023899961 in words is "one billion, twenty-three million, eight hundred ninety-nine thousand, nine hundred sixty-one".