72155001 has 4 divisors (see below), whose sum is σ = 96206672. Its totient is φ = 48103332.

The previous prime is 72154997. The next prime is 72155029. The reversal of 72155001 is 10055127.

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.

It is not a de Polignac number, because 72155001 - 2² = 72154997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72155081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12025831 + ... + 12025836.

It is an arithmetic number, because the mean of its divisors is an integer number (24051668).

Almost surely, 2^72155001 is an apocalyptic number.

It is an amenable number.

72155001 is a deficient number, since it is larger than the sum of its proper divisors (24051671).

72155001 is a wasteful number, since it uses less digits than its factorization.

72155001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24051670.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 72155001 is about 8494.4099853963. The cubic root of 72155001 is about 416.3150831148.

The spelling of 72155001 in words is "seventy-two million, one hundred fifty-five thousand, one".