159721954 has 8 divisors (see below), whose sum is σ = 273809088. Its totient is φ = 68452260.

The previous prime is 159721943. The next prime is 159721979. The reversal of 159721954 is 459127951.

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

It is a super-2 number, since 2×159721954² = 51022205179156232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 159721954.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5704342 + ... + 5704369.

It is an arithmetic number, because the mean of its divisors is an integer number (34226136).

Almost surely, 2^159721954 is an apocalyptic number.

159721954 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

159721954 is a deficient number, since it is larger than the sum of its proper divisors (114087134).

159721954 is a wasteful number, since it uses less digits than its factorization.

159721954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11408720.

The product of its digits is 113400, while the sum is 43.

The square root of 159721954 is about 12638.1151284517. The cubic root of 159721954 is about 542.5688689141.

The spelling of 159721954 in words is "one hundred fifty-nine million, seven hundred twenty-one thousand, nine hundred fifty-four".