2145061291 has 2 divisors, whose sum is σ = 2145061292. Its totient is φ = 2145061290.

The previous prime is 2145061283. The next prime is 2145061319. The reversal of 2145061291 is 1921605412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2145061291 - 2³ = 2145061283 is a prime.

It is not a weakly prime, because it can be changed into another prime (2145061591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072530645 + 1072530646.

It is an arithmetic number, because the mean of its divisors is an integer number (1072530646).

Almost surely, 2^2145061291 is an apocalyptic number.

2145061291 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145061291 is an equidigital number, since it uses as much as digits as its factorization.

2145061291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2145061291 is about 46314.8063906134. The cubic root of 2145061291 is about 1289.6738736510.

The spelling of 2145061291 in words is "two billion, one hundred forty-five million, sixty-one thousand, two hundred ninety-one".