653470991 has 4 divisors (see below), whose sum is σ = 653551512. Its totient is φ = 653390472.

The previous prime is 653470969. The next prime is 653471003. The reversal of 653470991 is 199074356.

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

It is a cyclic number.

It is not a de Polignac number, because 653470991 - 2⁶ = 653470927 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 (653470901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26525 + ... + 44838.

It is an arithmetic number, because the mean of its divisors is an integer number (163387878).

Almost surely, 2^653470991 is an apocalyptic number.

653470991 is a deficient number, since it is larger than the sum of its proper divisors (80521).

653470991 is an equidigital number, since it uses as much as digits as its factorization.

653470991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80520.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 653470991 is about 25563.0786682669. The cubic root of 653470991 is about 867.7782704860.

The spelling of 653470991 in words is "six hundred fifty-three million, four hundred seventy thousand, nine hundred ninety-one".