72551001 has 4 divisors (see below), whose sum is σ = 96734672. Its totient is φ = 48367332.

The previous prime is 72550999. The next prime is 72551023. The reversal of 72551001 is 10015527.

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 72551001 - 2¹ = 72550999 is a prime.

It is a super-2 number, since 2×72551001² = 10527295492204002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72551051) 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, 12091831 + ... + 12091836.

It is an arithmetic number, because the mean of its divisors is an integer number (24183668).

Almost surely, 2^72551001 is an apocalyptic number.

It is an amenable number.

72551001 is a deficient number, since it is larger than the sum of its proper divisors (24183671).

72551001 is a wasteful number, since it uses less digits than its factorization.

72551001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24183670.

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

The square root of 72551001 is about 8517.6875382935. The cubic root of 72551001 is about 417.0752988142.

Adding to 72551001 its reverse (10015527), we get a palindrome (82566528).

It can be divided in two parts, 7255 and 1001, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 72551001 in words is "seventy-two million, five hundred fifty-one thousand, one".