501293981 has 4 divisors (see below), whose sum is σ = 510752412. Its totient is φ = 491835552.

The previous prime is 501293959. The next prime is 501294061. The reversal of 501293981 is 189392105.

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

It can be written as a sum of positive squares in 2 ways, for example, as 410872900 + 90421081 = 20270^2 + 9509^2 .

It is a cyclic number.

It is not a de Polignac number, because 501293981 - 2⁶ = 501293917 is a prime.

It is a super-2 number, since 2×501293981² = 502591310773656722, 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 (501293941) 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, 4729136 + ... + 4729241.

It is an arithmetic number, because the mean of its divisors is an integer number (127688103).

Almost surely, 2^501293981 is an apocalyptic number.

It is an amenable number.

501293981 is a deficient number, since it is larger than the sum of its proper divisors (9458431).

501293981 is an equidigital number, since it uses as much as digits as its factorization.

501293981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9458430.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 501293981 is about 22389.5953737445. The cubic root of 501293981 is about 794.3846251157.

The spelling of 501293981 in words is "five hundred one million, two hundred ninety-three thousand, nine hundred eighty-one".