2147891951 has 2 divisors, whose sum is σ = 2147891952. Its totient is φ = 2147891950.

The previous prime is 2147891899. The next prime is 2147891953. The reversal of 2147891951 is 1591987412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2147891951 is a prime.

It is a super-2 number, since 2×2147891951² = 9226879666341172802, which contains 22 as substring.

Together with 2147891953, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2147891896 and 2147891905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2147891953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1073945975 + 1073945976.

It is an arithmetic number, because the mean of its divisors is an integer number (1073945976).

Almost surely, 2^2147891951 is an apocalyptic number.

2147891951 is a deficient number, since it is larger than the sum of its proper divisors (1).

2147891951 is an equidigital number, since it uses as much as digits as its factorization.

2147891951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 47.

The square root of 2147891951 is about 46345.3552257397. The cubic root of 2147891951 is about 1290.2409162848.

The spelling of 2147891951 in words is "two billion, one hundred forty-seven million, eight hundred ninety-one thousand, nine hundred fifty-one".