501072391 has 4 divisors (see below), whose sum is σ = 501762352. Its totient is φ = 500382432.

The previous prime is 501072371. The next prime is 501072449. The reversal of 501072391 is 193270105.

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 501072391 - 2¹¹ = 501070343 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 (501072301) 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, 343890 + ... + 345343.

It is an arithmetic number, because the mean of its divisors is an integer number (125440588).

Almost surely, 2^501072391 is an apocalyptic number.

501072391 is a deficient number, since it is larger than the sum of its proper divisors (689961).

501072391 is an equidigital number, since it uses as much as digits as its factorization.

501072391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689960.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 501072391 is about 22384.6463228705. The cubic root of 501072391 is about 794.2675589902.

The spelling of 501072391 in words is "five hundred one million, seventy-two thousand, three hundred ninety-one".