1561625438 has 8 divisors (see below), whose sum is σ = 2365630920. Its totient is φ = 773081800.

The previous prime is 1561625419. The next prime is 1561625467. The reversal of 1561625438 is 8345261651.

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

It is a junction number, because it is equal to n+sod(n) for n = 1561625395 and 1561625404.

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, 3865208 + ... + 3865611.

It is an arithmetic number, because the mean of its divisors is an integer number (295703865).

Almost surely, 2^1561625438 is an apocalyptic number.

1561625438 is a deficient number, since it is larger than the sum of its proper divisors (804005482).

1561625438 is a wasteful number, since it uses less digits than its factorization.

1561625438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7730922.

The product of its digits is 172800, while the sum is 41.

The square root of 1561625438 is about 39517.4067722061. The cubic root of 1561625438 is about 1160.1806689463.

The spelling of 1561625438 in words is "one billion, five hundred sixty-one million, six hundred twenty-five thousand, four hundred thirty-eight".