72929161 has 4 divisors (see below), whose sum is σ = 74625232. Its totient is φ = 71233092.

The previous prime is 72929123. The next prime is 72929179. The reversal of 72929161 is 16192927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16192927 = 89 ⋅181943.

It is a cyclic number.

It is not a de Polignac number, because 72929161 - 2⁷ = 72929033 is a prime.

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 72929161.

It is not an unprimeable number, because it can be changed into a prime (72929191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 847971 + ... + 848056.

It is an arithmetic number, because the mean of its divisors is an integer number (18656308).

Almost surely, 2^72929161 is an apocalyptic number.

It is an amenable number.

72929161 is a deficient number, since it is larger than the sum of its proper divisors (1696071).

72929161 is a wasteful number, since it uses less digits than its factorization.

72929161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696070.

The product of its digits is 13608, while the sum is 37.

The square root of 72929161 is about 8539.8572002113. The cubic root of 72929161 is about 417.7986885759.

It can be divided in two parts, 729 and 29161, that added together give a triangular number (29890 = T₂₄₄).

The spelling of 72929161 in words is "seventy-two million, nine hundred twenty-nine thousand, one hundred sixty-one".