72099001 has 4 divisors (see below), whose sum is σ = 77645092. Its totient is φ = 66552912.

The previous prime is 72098993. The next prime is 72099007. The reversal of 72099001 is 10099027.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47941776 + 24157225 = 6924^2 + 4915^2 .

It is a cyclic number.

It is not a de Polignac number, because 72099001 - 2³ = 72098993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72099007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2773026 + ... + 2773051.

It is an arithmetic number, because the mean of its divisors is an integer number (19411273).

Almost surely, 2^72099001 is an apocalyptic number.

It is an amenable number.

72099001 is a deficient number, since it is larger than the sum of its proper divisors (5546091).

72099001 is a wasteful number, since it uses less digits than its factorization.

72099001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5546090.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 72099001 is about 8491.1130601353. The cubic root of 72099001 is about 416.2073535594.

The spelling of 72099001 in words is "seventy-two million, ninety-nine thousand, one".