501661001131 has 8 divisors (see below), whose sum is σ = 504039594240. Its totient is φ = 499284336192.

The previous prime is 501661001089. The next prime is 501661001137. The reversal of 501661001131 is 131100166105.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 501661001131 - 2¹³ = 501660992939 is a prime.

It is a super-2 number, since 2×501661001131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 501661001096 and 501661001105.

It is not an unprimeable number, because it can be changed into a prime (501661001137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40881 + ... + 1002493.

It is an arithmetic number, because the mean of its divisors is an integer number (63004949280).

Almost surely, 2^501661001131 is an apocalyptic number.

501661001131 is a deficient number, since it is larger than the sum of its proper divisors (2378593109).

501661001131 is a wasteful number, since it uses less digits than its factorization.

501661001131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964085.

The product of its (nonzero) digits is 540, while the sum is 25.

Adding to 501661001131 its reverse (131100166105), we get a palindrome (632761167236).

The spelling of 501661001131 in words is "five hundred one billion, six hundred sixty-one million, one thousand, one hundred thirty-one".