1553440045 has 4 divisors (see below), whose sum is σ = 1864128060. Its totient is φ = 1242752032.

The previous prime is 1553440037. The next prime is 1553440061. The reversal of 1553440045 is 5400443551.

It is a happy number.

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 198979236 + 1354460809 = 14106^2 + 36803^2 .

It is a cyclic number.

It is not a de Polignac number, because 1553440045 - 2³ = 1553440037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1553439989 and 1553440016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155344000 + ... + 155344009.

It is an arithmetic number, because the mean of its divisors is an integer number (466032015).

Almost surely, 2^1553440045 is an apocalyptic number.

It is an amenable number.

1553440045 is a deficient number, since it is larger than the sum of its proper divisors (310688015).

1553440045 is an equidigital number, since it uses as much as digits as its factorization.

1553440045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310688014.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 1553440045 is about 39413.7037716579. The cubic root of 1553440045 is about 1158.1500549292.

Adding to 1553440045 its reverse (5400443551), we get a palindrome (6953883596).

The spelling of 1553440045 in words is "one billion, five hundred fifty-three million, four hundred forty thousand, forty-five".