1653509091 has 8 divisors (see below), whose sum is σ = 2374269520. Its totient is φ = 1017544032.

The previous prime is 1653509083. The next prime is 1653509101. The reversal of 1653509091 is 1909053561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1653509091 - 2³ = 1653509083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 42397669 = 1653509091 / (1 + 6 + 5 + 3 + 5 + 0 + 9 + 0 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1653509051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21198796 + ... + 21198873.

It is an arithmetic number, because the mean of its divisors is an integer number (296783690).

Almost surely, 2^1653509091 is an apocalyptic number.

1653509091 is a deficient number, since it is larger than the sum of its proper divisors (720760429).

1653509091 is a wasteful number, since it uses less digits than its factorization.

1653509091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42397685.

The product of its (nonzero) digits is 36450, while the sum is 39.

The square root of 1653509091 is about 40663.3630065198. The cubic root of 1653509091 is about 1182.5028487670.

The spelling of 1653509091 in words is "one billion, six hundred fifty-three million, five hundred nine thousand, ninety-one".