72191051 has 8 divisors (see below), whose sum is σ = 76115520. Its totient is φ = 68279112.

The previous prime is 72191017. The next prime is 72191057. The reversal of 72191051 is 15019127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72191051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72191051.

It is not an unprimeable number, because it can be changed into a prime (72191057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10196 + ... + 15758.

It is an arithmetic number, because the mean of its divisors is an integer number (9514440).

Almost surely, 2^72191051 is an apocalyptic number.

72191051 is a deficient number, since it is larger than the sum of its proper divisors (3924469).

72191051 is a wasteful number, since it uses less digits than its factorization.

72191051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6265.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 72191051 is about 8496.5317041720. The cubic root of 72191051 is about 416.3844045284.

The spelling of 72191051 in words is "seventy-two million, one hundred ninety-one thousand, fifty-one".