972729911 has 4 divisors (see below), whose sum is σ = 972865392. Its totient is φ = 972594432.

The previous prime is 972729887. The next prime is 972729917. The reversal of 972729911 is 119927279.

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

It is a cyclic number.

It is not a de Polignac number, because 972729911 - 2¹⁸ = 972467767 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 (972729917) 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, 56330 + ... + 71543.

It is an arithmetic number, because the mean of its divisors is an integer number (243216348).

Almost surely, 2^972729911 is an apocalyptic number.

972729911 is a deficient number, since it is larger than the sum of its proper divisors (135481).

972729911 is a wasteful number, since it uses less digits than its factorization.

972729911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135480.

The product of its digits is 142884, while the sum is 47.

The square root of 972729911 is about 31188.6182925759. The cubic root of 972729911 is about 990.8260666427.

The spelling of 972729911 in words is "nine hundred seventy-two million, seven hundred twenty-nine thousand, nine hundred eleven".