194153009 has 2 divisors, whose sum is σ = 194153010. Its totient is φ = 194153008.

The previous prime is 194152997. The next prime is 194153017. The reversal of 194153009 is 900351491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131790400 + 62362609 = 11480^2 + 7897^2 .

It is a cyclic number.

It is not a de Polignac number, because 194153009 - 2¹⁶ = 194087473 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (194153809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97076504 + 97076505.

It is an arithmetic number, because the mean of its divisors is an integer number (97076505).

Almost surely, 2^194153009 is an apocalyptic number.

It is an amenable number.

194153009 is a deficient number, since it is larger than the sum of its proper divisors (1).

194153009 is an equidigital number, since it uses as much as digits as its factorization.

194153009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 194153009 is about 13933.8798975734. The cubic root of 194153009 is about 579.0481901737.

The spelling of 194153009 in words is "one hundred ninety-four million, one hundred fifty-three thousand, nine".