2172078497 has 4 divisors (see below), whose sum is σ = 2172624576. Its totient is φ = 2171532420.

The previous prime is 2172078473. The next prime is 2172078509. The reversal of 2172078497 is 7948702712.

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 a de Polignac number, because none of the positive numbers 2^k-2172078497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2172078397) 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, 267029 + ... + 275042.

It is an arithmetic number, because the mean of its divisors is an integer number (543156144).

Almost surely, 2^2172078497 is an apocalyptic number.

It is an amenable number.

2172078497 is a deficient number, since it is larger than the sum of its proper divisors (546079).

2172078497 is an equidigital number, since it uses as much as digits as its factorization.

2172078497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546078.

The product of its (nonzero) digits is 395136, while the sum is 47.

The square root of 2172078497 is about 46605.5629404903. The cubic root of 2172078497 is about 1295.0658120129.

The spelling of 2172078497 in words is "two billion, one hundred seventy-two million, seventy-eight thousand, four hundred ninety-seven".