2157149729 has 8 divisors (see below), whose sum is σ = 2490730368. Its totient is φ = 1829923200.

The previous prime is 2157149723. The next prime is 2157149749. The reversal of 2157149729 is 9279417512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2157149729 - 2⁴ = 2157149713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2157149723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1587797 + ... + 1589154.

It is an arithmetic number, because the mean of its divisors is an integer number (311341296).

Almost surely, 2^2157149729 is an apocalyptic number.

It is an amenable number.

2157149729 is a deficient number, since it is larger than the sum of its proper divisors (333580639).

2157149729 is an equidigital number, since it uses as much as digits as its factorization.

2157149729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3177055.

The product of its digits is 317520, while the sum is 47.

The square root of 2157149729 is about 46445.1259983219. The cubic root of 2157149729 is about 1292.0919783027.

The spelling of 2157149729 in words is "two billion, one hundred fifty-seven million, one hundred forty-nine thousand, seven hundred twenty-nine".