2172501749 has 16 divisors (see below), whose sum is σ = 2392747776. Its totient is φ = 1956115200.

The previous prime is 2172501739. The next prime is 2172501803. The reversal of 2172501749 is 9471052712.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2172501749 - 2¹⁶ = 2172436213 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 (2172501739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 783764 + ... + 786530.

It is an arithmetic number, because the mean of its divisors is an integer number (149546736).

Almost surely, 2^2172501749 is an apocalyptic number.

It is an amenable number.

2172501749 is a deficient number, since it is larger than the sum of its proper divisors (220246027).

2172501749 is a wasteful number, since it uses less digits than its factorization.

2172501749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3436.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 2172501749 is about 46610.1035077160. The cubic root of 2172501749 is about 1295.1499255469.

The spelling of 2172501749 in words is "two billion, one hundred seventy-two million, five hundred one thousand, seven hundred forty-nine".