153490921 has 4 divisors (see below), whose sum is σ = 157234644. Its totient is φ = 149747200.

The previous prime is 153490879. The next prime is 153490973. The reversal of 153490921 is 129094351.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7080921 + 146410000 = 2661^2 + 12100^2 .

It is a cyclic number.

It is not a de Polignac number, because 153490921 - 2¹¹ = 153488873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (153490991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1871800 + ... + 1871881.

It is an arithmetic number, because the mean of its divisors is an integer number (39308661).

Almost surely, 2^153490921 is an apocalyptic number.

It is an amenable number.

153490921 is a deficient number, since it is larger than the sum of its proper divisors (3743723).

153490921 is an equidigital number, since it uses as much as digits as its factorization.

153490921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3743722.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 153490921 is about 12389.1452893248. The cubic root of 153490921 is about 535.4195573420.

The spelling of 153490921 in words is "one hundred fifty-three million, four hundred ninety thousand, nine hundred twenty-one".