1623609649 has 4 divisors (see below), whose sum is σ = 1628731764. Its totient is φ = 1618487536.

The previous prime is 1623609623. The next prime is 1623609653. The reversal of 1623609649 is 9469063261.

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 230827249 + 1392782400 = 15193^2 + 37320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1623609649 is a prime.

It is a super-2 number, since 2×1623609649² = 5272216584651806402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1623609599 and 1623609608.

It is not an unprimeable number, because it can be changed into a prime (1623609149) 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, 2560582 + ... + 2561215.

It is an arithmetic number, because the mean of its divisors is an integer number (407182941).

Almost surely, 2^1623609649 is an apocalyptic number.

It is an amenable number.

1623609649 is a deficient number, since it is larger than the sum of its proper divisors (5122115).

1623609649 is an equidigital number, since it uses as much as digits as its factorization.

1623609649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5122114.

The product of its (nonzero) digits is 419904, while the sum is 46.

The square root of 1623609649 is about 40294.0398694397. The cubic root of 1623609649 is about 1175.3319476195.

The spelling of 1623609649 in words is "one billion, six hundred twenty-three million, six hundred nine thousand, six hundred forty-nine".