1040042091 has 8 divisors (see below), whose sum is σ = 1512788544. Its totient is φ = 630328520.

The previous prime is 1040042077. The next prime is 1040042119. The reversal of 1040042091 is 1902400401.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1040042091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1040042011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15758181 + ... + 15758246.

It is an arithmetic number, because the mean of its divisors is an integer number (189098568).

Almost surely, 2^1040042091 is an apocalyptic number.

1040042091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1040042091 is a deficient number, since it is larger than the sum of its proper divisors (472746453).

1040042091 is a wasteful number, since it uses less digits than its factorization.

1040042091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31516441.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1040042091 is about 32249.6835798431. The cubic root of 1040042091 is about 1013.1730718706.

Adding to 1040042091 its reverse (1902400401), we get a palindrome (2942442492).

The spelling of 1040042091 in words is "one billion, forty million, forty-two thousand, ninety-one".