1618245649 has 4 divisors (see below), whose sum is σ = 1618355200. Its totient is φ = 1618136100.

The previous prime is 1618245647. The next prime is 1618245659. The reversal of 1618245649 is 9465428161.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9465428161 = 7 ⋅1352204023.

It is a cyclic number.

It is not a de Polignac number, because 1618245649 - 2¹ = 1618245647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1618245599 and 1618245608.

It is not an unprimeable number, because it can be changed into a prime (1618245647) 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, 28377 + ... + 63574.

It is an arithmetic number, because the mean of its divisors is an integer number (404588800).

Almost surely, 2^1618245649 is an apocalyptic number.

It is an amenable number.

1618245649 is a deficient number, since it is larger than the sum of its proper divisors (109551).

1618245649 is an equidigital number, since it uses as much as digits as its factorization.

1618245649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109550.

The product of its digits is 414720, while the sum is 46.

The square root of 1618245649 is about 40227.4240910352. The cubic root of 1618245649 is about 1174.0361853959.

The spelling of 1618245649 in words is "one billion, six hundred eighteen million, two hundred forty-five thousand, six hundred forty-nine".