2172512949 has 4 divisors (see below), whose sum is σ = 2896683936. Its totient is φ = 1448341964.

The previous prime is 2172512921. The next prime is 2172512957. The reversal of 2172512949 is 9492152712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2172512949 - 2⁵ = 2172512917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2172512949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172512549) 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, 362085489 + ... + 362085494.

It is an arithmetic number, because the mean of its divisors is an integer number (724170984).

Almost surely, 2^2172512949 is an apocalyptic number.

It is an amenable number.

2172512949 is a deficient number, since it is larger than the sum of its proper divisors (724170987).

2172512949 is an equidigital number, since it uses as much as digits as its factorization.

2172512949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724170986.

The product of its digits is 90720, while the sum is 42.

The square root of 2172512949 is about 46610.2236531858. The cubic root of 2172512949 is about 1295.1521511921.

The spelling of 2172512949 in words is "two billion, one hundred seventy-two million, five hundred twelve thousand, nine hundred forty-nine".