121673653 has 2 divisors, whose sum is σ = 121673654. Its totient is φ = 121673652.

The previous prime is 121673633. The next prime is 121673683. The reversal of 121673653 is 356376121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106874244 + 14799409 = 10338^2 + 3847^2 .

It is an emirp because it is prime and its reverse (356376121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121673653 - 2⁵ = 121673621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121673603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60836826 + 60836827.

It is an arithmetic number, because the mean of its divisors is an integer number (60836827).

Almost surely, 2^121673653 is an apocalyptic number.

It is an amenable number.

121673653 is a deficient number, since it is larger than the sum of its proper divisors (1).

121673653 is an equidigital number, since it uses as much as digits as its factorization.

121673653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 34.

The square root of 121673653 is about 11030.5780900187. The cubic root of 121673653 is about 495.5249377944.

The spelling of 121673653 in words is "one hundred twenty-one million, six hundred seventy-three thousand, six hundred fifty-three".