1561554023 has 8 divisors (see below), whose sum is σ = 1676060928. Its totient is φ = 1449563904.

The previous prime is 1561554013. The next prime is 1561554037. The reversal of 1561554023 is 3204551651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1561554023 - 2¹⁰ = 1561552999 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 (1561554013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 627911 + ... + 630392.

It is an arithmetic number, because the mean of its divisors is an integer number (209507616).

Almost surely, 2^1561554023 is an apocalyptic number.

1561554023 is a deficient number, since it is larger than the sum of its proper divisors (114506905).

1561554023 is a wasteful number, since it uses less digits than its factorization.

1561554023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258393.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 1561554023 is about 39516.5031727252. The cubic root of 1561554023 is about 1160.1629831933.

The spelling of 1561554023 in words is "one billion, five hundred sixty-one million, five hundred fifty-four thousand, twenty-three".