1561400633 has 12 divisors (see below), whose sum is σ = 1698799248. Its totient is φ = 1434429360.

The previous prime is 1561400627. The next prime is 1561400669. The reversal of 1561400633 is 3360041651.

It is a happy number.

It is not a de Polignac number, because 1561400633 - 2⁶ = 1561400569 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1561400596 and 1561400605.

It is not an unprimeable number, because it can be changed into a prime (1561400833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13766 + ... + 57552.

It is an arithmetic number, because the mean of its divisors is an integer number (141566604).

Almost surely, 2^1561400633 is an apocalyptic number.

1561400633 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1561400633 is a deficient number, since it is larger than the sum of its proper divisors (137398615).

1561400633 is a wasteful number, since it uses less digits than its factorization.

1561400633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44024 (or 44011 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 1561400633 is about 39514.5622903759. The cubic root of 1561400633 is about 1160.1249947056.

The spelling of 1561400633 in words is "one billion, five hundred sixty-one million, four hundred thousand, six hundred thirty-three".