1653682491 has 12 divisors (see below), whose sum is σ = 2410568160. Its totient is φ = 1092340080.

The previous prime is 1653682487. The next prime is 1653682501. The reversal of 1653682491 is 1942863561.

1653682491 is a `hidden beast` number, since 1 + 6 + 536 + 8 + 24 + 91 = 666.

It is not a de Polignac number, because 1653682491 - 2² = 1653682487 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1653682411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 841875 + ... + 843836.

It is an arithmetic number, because the mean of its divisors is an integer number (200880680).

Almost surely, 2^1653682491 is an apocalyptic number.

1653682491 is a deficient number, since it is larger than the sum of its proper divisors (756885669).

1653682491 is a wasteful number, since it uses less digits than its factorization.

1653682491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685826 (or 1685823 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 1653682491 is about 40665.4950910474. The cubic root of 1653682491 is about 1182.5441828462.

The spelling of 1653682491 in words is "one billion, six hundred fifty-three million, six hundred eighty-two thousand, four hundred ninety-one".