2147945391 has 32 divisors (see below), whose sum is σ = 3295139840. Its totient is φ = 1381406400.

The previous prime is 2147945369. The next prime is 2147945411. The reversal of 2147945391 is 1935497412.

2147945391 is a `hidden beast` number, since 21 + 4 + 7 + 94 + 539 + 1 = 666.

It is not a de Polignac number, because 2147945391 - 2⁷ = 2147945263 is a prime.

It is a super-2 number, since 2×2147945391² = 9227338805436285762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2147945311) 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 31 ways as a sum of consecutive naturals, for example, 273171 + ... + 280923.

It is an arithmetic number, because the mean of its divisors is an integer number (102973120).

Almost surely, 2^2147945391 is an apocalyptic number.

2147945391 is a deficient number, since it is larger than the sum of its proper divisors (1147194449).

2147945391 is a wasteful number, since it uses less digits than its factorization.

2147945391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8124 (or 8118 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 2147945391 is about 46345.9317632087. The cubic root of 2147945391 is about 1290.2516166838.

The spelling of 2147945391 in words is "two billion, one hundred forty-seven million, nine hundred forty-five thousand, three hundred ninety-one".