1019054991 has 4 divisors (see below), whose sum is σ = 1358739992. Its totient is φ = 679369992.

The previous prime is 1019054989. The next prime is 1019055001. The reversal of 1019054991 is 1994509101.

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

It is not a de Polignac number, because 1019054991 - 2¹ = 1019054989 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 (1019054941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169842496 + ... + 169842501.

It is an arithmetic number, because the mean of its divisors is an integer number (339684998).

Almost surely, 2^1019054991 is an apocalyptic number.

1019054991 is a deficient number, since it is larger than the sum of its proper divisors (339685001).

1019054991 is an equidigital number, since it uses as much as digits as its factorization.

1019054991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339685000.

The product of its (nonzero) digits is 14580, while the sum is 39.

The square root of 1019054991 is about 31922.6407272331. The cubic root of 1019054991 is about 1006.3117417666.

The spelling of 1019054991 in words is "one billion, nineteen million, fifty-four thousand, nine hundred ninety-one".