2151249191 has 16 divisors (see below), whose sum is σ = 2683969344. Its totient is φ = 1678765824.

The previous prime is 2151249187. The next prime is 2151249223. The reversal of 2151249191 is 1919421512.

It is a cyclic number.

It is not a de Polignac number, because 2151249191 - 2² = 2151249187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151249161) 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, 155276 + ... + 168561.

It is an arithmetic number, because the mean of its divisors is an integer number (167748084).

Almost surely, 2^2151249191 is an apocalyptic number.

2151249191 is a deficient number, since it is larger than the sum of its proper divisors (532720153).

2151249191 is a wasteful number, since it uses less digits than its factorization.

2151249191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323930.

The product of its digits is 6480, while the sum is 35.

The square root of 2151249191 is about 46381.5608943899. The cubic root of 2151249191 is about 1290.9127988600.

The spelling of 2151249191 in words is "two billion, one hundred fifty-one million, two hundred forty-nine thousand, one hundred ninety-one".