1045019381 has 4 divisors (see below), whose sum is σ = 1194307872. Its totient is φ = 895730892.

The previous prime is 1045019377. The next prime is 1045019389. The reversal of 1045019381 is 1839105401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1839105401 = 7 ⋅262729343.

It is not a de Polignac number, because 1045019381 - 2² = 1045019377 is a prime.

It is a super-2 number, since 2×1045019381² = 2184131013331246322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045019389) 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, 74644235 + ... + 74644248.

It is an arithmetic number, because the mean of its divisors is an integer number (298576968).

Almost surely, 2^1045019381 is an apocalyptic number.

It is an amenable number.

1045019381 is a deficient number, since it is larger than the sum of its proper divisors (149288491).

1045019381 is an equidigital number, since it uses as much as digits as its factorization.

1045019381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149288490.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 1045019381 is about 32326.7595190115. The cubic root of 1045019381 is about 1014.7867351039.

The spelling of 1045019381 in words is "one billion, forty-five million, nineteen thousand, three hundred eighty-one".