211172749057 has 4 divisors (see below), whose sum is σ = 218454568020. Its totient is φ = 203890930096.

The previous prime is 211172749043. The next prime is 211172749063. The reversal of 211172749057 is 750947271112.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 99323304336 + 111849444721 = 315156^2 + 334439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211172749057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211172748998 and 211172749016.

It is not an unprimeable number, because it can be changed into a prime (211172749037) 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, 3640909438 + ... + 3640909495.

It is an arithmetic number, because the mean of its divisors is an integer number (54613642005).

Almost surely, 2^211172749057 is an apocalyptic number.

It is an amenable number.

211172749057 is a deficient number, since it is larger than the sum of its proper divisors (7281818963).

211172749057 is an equidigital number, since it uses as much as digits as its factorization.

211172749057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7281818962.

The product of its (nonzero) digits is 246960, while the sum is 46.

The spelling of 211172749057 in words is "two hundred eleven billion, one hundred seventy-two million, seven hundred forty-nine thousand, fifty-seven".