1561223054 has 16 divisors (see below), whose sum is σ = 2441321856. Its totient is φ = 747948000.

The previous prime is 1561223009. The next prime is 1561223057. The reversal of 1561223054 is 4503221651.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561223057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118397 + ... + 130920.

It is an arithmetic number, because the mean of its divisors is an integer number (152582616).

Almost surely, 2^1561223054 is an apocalyptic number.

1561223054 is a deficient number, since it is larger than the sum of its proper divisors (880098802).

1561223054 is a wasteful number, since it uses less digits than its factorization.

1561223054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249451.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1561223054 is about 39512.3152194351. The cubic root of 1561223054 is about 1160.0810124753.

The spelling of 1561223054 in words is "one billion, five hundred sixty-one million, two hundred twenty-three thousand, fifty-four".