1042521393791 has 4 divisors (see below), whose sum is σ = 1078470407400. Its totient is φ = 1006572380184.

The previous prime is 1042521393751. The next prime is 1042521393799. The reversal of 1042521393791 is 1973931252401.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1042521393791 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 (1042521393799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17974506761 + ... + 17974506818.

It is an arithmetic number, because the mean of its divisors is an integer number (269617601850).

Almost surely, 2^{1042521393791} is an apocalyptic number.

1042521393791 is a deficient number, since it is larger than the sum of its proper divisors (35949013609).

1042521393791 is an equidigital number, since it uses as much as digits as its factorization.

1042521393791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35949013608.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 1042521393791 in words is "one trillion, forty-two billion, five hundred twenty-one million, three hundred ninety-three thousand, seven hundred ninety-one".