1651654985 has 4 divisors (see below), whose sum is σ = 1981985988. Its totient is φ = 1321323984.

The previous prime is 1651654957. The next prime is 1651654997. The reversal of 1651654985 is 5894561561.

It is a happy number.

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 307406089 + 1344248896 = 17533^2 + 36664^2 .

It is a cyclic number.

It is not a de Polignac number, because 1651654985 - 2²⁸ = 1383219529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165165494 + ... + 165165503.

It is an arithmetic number, because the mean of its divisors is an integer number (495496497).

Almost surely, 2^1651654985 is an apocalyptic number.

It is an amenable number.

1651654985 is a deficient number, since it is larger than the sum of its proper divisors (330331003).

1651654985 is an equidigital number, since it uses as much as digits as its factorization.

1651654985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330331002.

The product of its digits is 1296000, while the sum is 50.

The square root of 1651654985 is about 40640.5583746090. The cubic root of 1651654985 is about 1182.0606970548.

The spelling of 1651654985 in words is "one billion, six hundred fifty-one million, six hundred fifty-four thousand, nine hundred eighty-five".