1651679649 has 6 divisors (see below), whose sum is σ = 2385759506. Its totient is φ = 1101119760.

The previous prime is 1651679621. The next prime is 1651679663. The reversal of 1651679649 is 9469761561.

It is a happy number.

1651679649 is a `hidden beast` number, since 16 + 516 + 79 + 6 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1617246225 + 34433424 = 40215^2 + 5868^2 .

It is not a de Polignac number, because 1651679649 - 2¹³ = 1651671457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1651679595 and 1651679604.

It is not an unprimeable number, because it can be changed into a prime (1651679609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91759972 + ... + 91759989.

Almost surely, 2^1651679649 is an apocalyptic number.

It is an amenable number.

1651679649 is a deficient number, since it is larger than the sum of its proper divisors (734079857).

1651679649 is a wasteful number, since it uses less digits than its factorization.

1651679649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183519967 (or 183519964 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 1651679649 is about 40640.8618141889. The cubic root of 1651679649 is about 1182.0665808905.

The spelling of 1651679649 in words is "one billion, six hundred fifty-one million, six hundred seventy-nine thousand, six hundred forty-nine".