1553050921 has 2 divisors, whose sum is σ = 1553050922. Its totient is φ = 1553050920.

The previous prime is 1553050907. The next prime is 1553050943. The reversal of 1553050921 is 1290503551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1161446400 + 391604521 = 34080^2 + 19789^2 .

It is an emirp because it is prime and its reverse (1290503551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1553050921 - 2¹¹ = 1553048873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1553050901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776525460 + 776525461.

It is an arithmetic number, because the mean of its divisors is an integer number (776525461).

Almost surely, 2^1553050921 is an apocalyptic number.

It is an amenable number.

1553050921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553050921 is an equidigital number, since it uses as much as digits as its factorization.

1553050921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 31.

The square root of 1553050921 is about 39408.7670575977. The cubic root of 1553050921 is about 1158.0533444880.

The spelling of 1553050921 in words is "one billion, five hundred fifty-three million, fifty thousand, nine hundred twenty-one".