1802689649 has 4 divisors (see below), whose sum is σ = 1860840960. Its totient is φ = 1744538340.

The previous prime is 1802689631. The next prime is 1802689661. The reversal of 1802689649 is 9469862081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9469862081 = 36229 ⋅261389.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1802689649 is a prime.

It is a super-2 number, since 2×1802689649² = 6499379941223486402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1802689649.

It is not an unprimeable number, because it can be changed into a prime (1802689549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29075609 + ... + 29075670.

It is an arithmetic number, because the mean of its divisors is an integer number (465210240).

Almost surely, 2^1802689649 is an apocalyptic number.

It is an amenable number.

1802689649 is a deficient number, since it is larger than the sum of its proper divisors (58151311).

1802689649 is an equidigital number, since it uses as much as digits as its factorization.

1802689649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58151310.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The square root of 1802689649 is about 42458.0928563684. The cubic root of 1802689649 is about 1217.0459860456.

The spelling of 1802689649 in words is "one billion, eight hundred two million, six hundred eighty-nine thousand, six hundred forty-nine".