1623551243 has 4 divisors (see below), whose sum is σ = 1635402120. Its totient is φ = 1611700368.

The previous prime is 1623551239. The next prime is 1623551263. The reversal of 1623551243 is 3421553261.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1623551243 - 2² = 1623551239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1623551263) 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, 5925233 + ... + 5925506.

It is an arithmetic number, because the mean of its divisors is an integer number (408850530).

Almost surely, 2^1623551243 is an apocalyptic number.

1623551243 is a deficient number, since it is larger than the sum of its proper divisors (11850877).

1623551243 is a wasteful number, since it uses less digits than its factorization.

1623551243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11850876.

The product of its digits is 21600, while the sum is 32.

The square root of 1623551243 is about 40293.3151155375. The cubic root of 1623551243 is about 1175.3178540716.

The spelling of 1623551243 in words is "one billion, six hundred twenty-three million, five hundred fifty-one thousand, two hundred forty-three".