2151725649 has 8 divisors (see below), whose sum is σ = 3037730400. Its totient is φ = 1350102336.

The previous prime is 2151725629. The next prime is 2151725657. The reversal of 2151725649 is 9465271512.

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

It is not a de Polignac number, because 2151725649 - 2⁵ = 2151725617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2151725649.

It is not an unprimeable number, because it can be changed into a prime (2151725629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21095299 + ... + 21095400.

It is an arithmetic number, because the mean of its divisors is an integer number (379716300).

Almost surely, 2^2151725649 is an apocalyptic number.

It is an amenable number.

2151725649 is a deficient number, since it is larger than the sum of its proper divisors (886004751).

2151725649 is a wasteful number, since it uses less digits than its factorization.

2151725649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42190719.

The product of its digits is 151200, while the sum is 42.

The square root of 2151725649 is about 46386.6968968475. The cubic root of 2151725649 is about 1291.0080954796.

The spelling of 2151725649 in words is "two billion, one hundred fifty-one million, seven hundred twenty-five thousand, six hundred forty-nine".