2154923591 has 2 divisors, whose sum is σ = 2154923592. Its totient is φ = 2154923590.

The previous prime is 2154923489. The next prime is 2154923717. The reversal of 2154923591 is 1953294512.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154923591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154922591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077461795 + 1077461796.

It is an arithmetic number, because the mean of its divisors is an integer number (1077461796).

Almost surely, 2^2154923591 is an apocalyptic number.

2154923591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154923591 is an equidigital number, since it uses as much as digits as its factorization.

2154923591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 41.

The square root of 2154923591 is about 46421.1545634100. The cubic root of 2154923591 is about 1291.6473537693.

The spelling of 2154923591 in words is "two billion, one hundred fifty-four million, nine hundred twenty-three thousand, five hundred ninety-one".