72351571 has 4 divisors (see below), whose sum is σ = 73164600. Its totient is φ = 71538544.

The previous prime is 72351557. The next prime is 72351577. The reversal of 72351571 is 17515327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17515327 = 79 ⋅221713.

It is a cyclic number.

It is not a de Polignac number, because 72351571 - 2¹⁵ = 72318803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72351577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406381 + ... + 406558.

It is an arithmetic number, because the mean of its divisors is an integer number (18291150).

Almost surely, 2^72351571 is an apocalyptic number.

72351571 is a deficient number, since it is larger than the sum of its proper divisors (813029).

72351571 is an equidigital number, since it uses as much as digits as its factorization.

72351571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813028.

The product of its digits is 7350, while the sum is 31.

The square root of 72351571 is about 8505.9726663092. The cubic root of 72351571 is about 416.6927924596.

Adding to 72351571 its reverse (17515327), we get a palindrome (89866898).

The spelling of 72351571 in words is "seventy-two million, three hundred fifty-one thousand, five hundred seventy-one".