1561275854 has 12 divisors (see below), whose sum is σ = 2365510056. Its totient is φ = 772778112.

The previous prime is 1561275853. The next prime is 1561275883. The reversal of 1561275854 is 4585721651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561275853) 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, 565742 + ... + 568494.

It is an arithmetic number, because the mean of its divisors is an integer number (197125838).

Almost surely, 2^1561275854 is an apocalyptic number.

1561275854 is a deficient number, since it is larger than the sum of its proper divisors (804234202).

1561275854 is an frugal number, since it uses more digits than its factorization.

1561275854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5611 (or 2858 counting only the distinct ones).

The product of its digits is 336000, while the sum is 44.

The square root of 1561275854 is about 39512.9833599034. The cubic root of 1561275854 is about 1160.0940901682.

The spelling of 1561275854 in words is "one billion, five hundred sixty-one million, two hundred seventy-five thousand, eight hundred fifty-four".