501670981 has 12 divisors (see below), whose sum is σ = 587126496. Its totient is φ = 419678280.

The previous prime is 501670979. The next prime is 501670991. The reversal of 501670981 is 189076105.

It is not a de Polignac number, because 501670981 - 2¹ = 501670979 is a prime.

It is a super-2 number, since 2×501670981² = 503347546355004722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 501670981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501670921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 387946 + ... + 389236.

It is an arithmetic number, because the mean of its divisors is an integer number (48927208).

Almost surely, 2^501670981 is an apocalyptic number.

It is an amenable number.

501670981 is a deficient number, since it is larger than the sum of its proper divisors (85455515).

501670981 is an frugal number, since it uses more digits than its factorization.

501670981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632 (or 1341 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 501670981 is about 22398.0128806106. The cubic root of 501670981 is about 794.5837151844.

The spelling of 501670981 in words is "five hundred one million, six hundred seventy thousand, nine hundred eighty-one".