162501721 has 8 divisors (see below), whose sum is σ = 168447488. Its totient is φ = 156600000.

The previous prime is 162501679. The next prime is 162501727. The reversal of 162501721 is 127105261.

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 162501721 - 2¹⁵ = 162468953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (162501727) 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, 3405 + ... + 18346.

It is an arithmetic number, because the mean of its divisors is an integer number (21055936).

Almost surely, 2^162501721 is an apocalyptic number.

It is an amenable number.

162501721 is a deficient number, since it is larger than the sum of its proper divisors (5945767).

162501721 is a wasteful number, since it uses less digits than its factorization.

162501721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22023.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 162501721 is about 12747.6162869769. The cubic root of 162501721 is about 545.6983679721.

Adding to 162501721 its reverse (127105261), we get a palindrome (289606982).

It can be divided in two parts, 16250 and 1721, that added together give a palindrome (17971).

The spelling of 162501721 in words is "one hundred sixty-two million, five hundred one thousand, seven hundred twenty-one".