1033378991 has 4 divisors (see below), whose sum is σ = 1035906000. Its totient is φ = 1030851984.

The previous prime is 1033378981. The next prime is 1033379057. The reversal of 1033378991 is 1998733301.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1033378991 - 2²⁶ = 966270127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1033378981) 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 3 ways as a sum of consecutive naturals, for example, 1262891 + ... + 1263708.

It is an arithmetic number, because the mean of its divisors is an integer number (258976500).

Almost surely, 2^1033378991 is an apocalyptic number.

1033378991 is a deficient number, since it is larger than the sum of its proper divisors (2527009).

1033378991 is an equidigital number, since it uses as much as digits as its factorization.

1033378991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527008.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 1033378991 is about 32146.2127007211. The cubic root of 1033378991 is about 1011.0047808856.

The spelling of 1033378991 in words is "one billion, thirty-three million, three hundred seventy-eight thousand, nine hundred ninety-one".