72151573 has 4 divisors (see below), whose sum is σ = 77701708. Its totient is φ = 66601440.

The previous prime is 72151567. The next prime is 72151579. The reversal of 72151573 is 37515127.

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

It is an interprime number because it is at equal distance from previous prime (72151567) and next prime (72151579).

It can be written as a sum of positive squares in 2 ways, for example, as 48121969 + 24029604 = 6937^2 + 4902^2 .

It is a cyclic number.

It is not a de Polignac number, because 72151573 - 2⁹ = 72151061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72151579) 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, 2775048 + ... + 2775073.

It is an arithmetic number, because the mean of its divisors is an integer number (19425427).

Almost surely, 2^72151573 is an apocalyptic number.

It is an amenable number.

72151573 is a deficient number, since it is larger than the sum of its proper divisors (5550135).

72151573 is a wasteful number, since it uses less digits than its factorization.

72151573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5550134.

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

The square root of 72151573 is about 8494.2082032406. The cubic root of 72151573 is about 416.3084901290.

The spelling of 72151573 in words is "seventy-two million, one hundred fifty-one thousand, five hundred seventy-three".