1553561023 has 6 divisors (see below), whose sum is σ = 1807203696. Its totient is φ = 1331623692.

The previous prime is 1553560999. The next prime is 1553561029. The reversal of 1553561023 is 3201653551.

It is a de Polignac number, because none of the positive numbers 2^k-1553561023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553561029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15852615 + ... + 15852712.

It is an arithmetic number, because the mean of its divisors is an integer number (301200616).

Almost surely, 2^1553561023 is an apocalyptic number.

1553561023 is a deficient number, since it is larger than the sum of its proper divisors (253642673).

1553561023 is an equidigital number, since it uses as much as digits as its factorization.

1553561023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31705341 (or 31705334 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 1553561023 is about 39415.2384617929. The cubic root of 1553561023 is about 1158.1801187524.

The spelling of 1553561023 in words is "one billion, five hundred fifty-three million, five hundred sixty-one thousand, twenty-three".