2154090409 has 2 divisors, whose sum is σ = 2154090410. Its totient is φ = 2154090408.

The previous prime is 2154090347. The next prime is 2154090427. The reversal of 2154090409 is 9040904512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1742812009 + 411278400 = 41747^2 + 20280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154090409 is a prime.

It is not a weakly prime, because it can be changed into another prime (2154090469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077045204 + 1077045205.

It is an arithmetic number, because the mean of its divisors is an integer number (1077045205).

Almost surely, 2^2154090409 is an apocalyptic number.

It is an amenable number.

2154090409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154090409 is an equidigital number, since it uses as much as digits as its factorization.

2154090409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 2154090409 is about 46412.1795329631. The cubic root of 2154090409 is about 1291.4808643312.

The spelling of 2154090409 in words is "two billion, one hundred fifty-four million, ninety thousand, four hundred nine".