1023329991 has 16 divisors (see below), whose sum is σ = 1382242176. Its totient is φ = 673335456.

The previous prime is 1023329971. The next prime is 1023330023. The reversal of 1023329991 is 1999233201.

It is not a de Polignac number, because 1023329991 - 2⁵ = 1023329959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023329971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 490236 + ... + 492318.

It is an arithmetic number, because the mean of its divisors is an integer number (86390136).

Almost surely, 2^1023329991 is an apocalyptic number.

1023329991 is a deficient number, since it is larger than the sum of its proper divisors (358912185).

1023329991 is a wasteful number, since it uses less digits than its factorization.

1023329991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4142.

The product of its (nonzero) digits is 26244, while the sum is 39.

The square root of 1023329991 is about 31989.5293963509. The cubic root of 1023329991 is about 1007.7169590247.

The spelling of 1023329991 in words is "one billion, twenty-three million, three hundred twenty-nine thousand, nine hundred ninety-one".