501330981 has 4 divisors (see below), whose sum is σ = 668441312. Its totient is φ = 334220652.

The previous prime is 501330959. The next prime is 501330989. The reversal of 501330981 is 189033105.

It is a happy number.

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.

It is not a de Polignac number, because 501330981 - 2²¹ = 499233829 is a prime.

It is a super-2 number, since 2×501330981² = 502665505020844722, 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 (501330989) 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, 83555161 + ... + 83555166.

It is an arithmetic number, because the mean of its divisors is an integer number (167110328).

Almost surely, 2^501330981 is an apocalyptic number.

It is an amenable number.

501330981 is a deficient number, since it is larger than the sum of its proper divisors (167110331).

501330981 is a wasteful number, since it uses less digits than its factorization.

501330981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167110330.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 501330981 is about 22390.4216351546. The cubic root of 501330981 is about 794.4041688759.

The spelling of 501330981 in words is "five hundred one million, three hundred thirty thousand, nine hundred eighty-one".