1561263054 has 16 divisors (see below), whose sum is σ = 3362720592. Its totient is φ = 480388608.

The previous prime is 1561263043. The next prime is 1561263059. The reversal of 1561263054 is 4503621651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561263059) 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, 10008019 + ... + 10008174.

It is an arithmetic number, because the mean of its divisors is an integer number (210170037).

Almost surely, 2^1561263054 is an apocalyptic number.

1561263054 is an abundant number, since it is smaller than the sum of its proper divisors (1801457538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561263054 is a wasteful number, since it uses less digits than its factorization.

1561263054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20016211.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1561263054 is about 39512.8213874940. The cubic root of 1561263054 is about 1160.0909198455.

The spelling of 1561263054 in words is "one billion, five hundred sixty-one million, two hundred sixty-three thousand, fifty-four".