1561217054 has 16 divisors (see below), whose sum is σ = 2384432640. Its totient is φ = 766438680.

The previous prime is 1561217051. The next prime is 1561217087. The reversal of 1561217054 is 4507121651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561217054.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561217051) 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, 94169 + ... + 109499.

It is an arithmetic number, because the mean of its divisors is an integer number (149027040).

Almost surely, 2^1561217054 is an apocalyptic number.

1561217054 is a deficient number, since it is larger than the sum of its proper divisors (823215586).

1561217054 is a wasteful number, since it uses less digits than its factorization.

1561217054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16255.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 1561217054 is about 39512.2392936670. The cubic root of 1561217054 is about 1160.0795263551.

The spelling of 1561217054 in words is "one billion, five hundred sixty-one million, two hundred seventeen thousand, fifty-four".