2154745181 has 2 divisors, whose sum is σ = 2154745182. Its totient is φ = 2154745180.

The previous prime is 2154745171. The next prime is 2154745193. The reversal of 2154745181 is 1815474512.

2154745181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1921419556 + 233325625 = 43834^2 + 15275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154745181 is a prime.

It is a super-2 number, since 2×2154745181² = 9285853590085445522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154745171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077372590 + 1077372591.

It is an arithmetic number, because the mean of its divisors is an integer number (1077372591).

Almost surely, 2^2154745181 is an apocalyptic number.

It is an amenable number.

2154745181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154745181 is an equidigital number, since it uses as much as digits as its factorization.

2154745181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44800, while the sum is 38.

The square root of 2154745181 is about 46419.2328781939. The cubic root of 2154745181 is about 1291.6117068496.

The spelling of 2154745181 in words is "two billion, one hundred fifty-four million, seven hundred forty-five thousand, one hundred eighty-one".