1653155221 has 4 divisors (see below), whose sum is σ = 1653292000. Its totient is φ = 1653018444.

The previous prime is 1653155209. The next prime is 1653155261. The reversal of 1653155221 is 1225513561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1653155221 - 2²⁵ = 1619600789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1653155261) 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, 48291 + ... + 75088.

It is an arithmetic number, because the mean of its divisors is an integer number (413323000).

Almost surely, 2^1653155221 is an apocalyptic number.

It is an amenable number.

1653155221 is a deficient number, since it is larger than the sum of its proper divisors (136779).

1653155221 is a wasteful number, since it uses less digits than its factorization.

1653155221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136778.

The product of its digits is 9000, while the sum is 31.

The square root of 1653155221 is about 40659.0115595547. The cubic root of 1653155221 is about 1182.4184863364.

Adding to 1653155221 its reverse (1225513561), we get a palindrome (2878668782).

The spelling of 1653155221 in words is "one billion, six hundred fifty-three million, one hundred fifty-five thousand, two hundred twenty-one".