1953656489 has 4 divisors (see below), whose sum is σ = 1953913860. Its totient is φ = 1953399120.

The previous prime is 1953656483. The next prime is 1953656503. The reversal of 1953656489 is 9846563591.

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 454030864 + 1499625625 = 21308^2 + 38725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1953656489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1953656483) 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, 116942 + ... + 132599.

It is an arithmetic number, because the mean of its divisors is an integer number (488478465).

Almost surely, 2^1953656489 is an apocalyptic number.

It is an amenable number.

1953656489 is a deficient number, since it is larger than the sum of its proper divisors (257371).

1953656489 is an equidigital number, since it uses as much as digits as its factorization.

1953656489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257370.

The product of its digits is 6998400, while the sum is 56.

The square root of 1953656489 is about 44200.1865267557. The cubic root of 1953656489 is about 1250.1133740368.

The spelling of 1953656489 in words is "one billion, nine hundred fifty-three million, six hundred fifty-six thousand, four hundred eighty-nine".