1561601554 has 8 divisors (see below), whose sum is σ = 2352721968. Its totient is φ = 777360900.

The previous prime is 1561601551. The next prime is 1561601617. The reversal of 1561601554 is 4551061651.

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

It is not an unprimeable number, because it can be changed into a prime (1561601551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1719372 + ... + 1720279.

It is an arithmetic number, because the mean of its divisors is an integer number (294090246).

Almost surely, 2^1561601554 is an apocalyptic number.

1561601554 is a deficient number, since it is larger than the sum of its proper divisors (791120414).

1561601554 is a wasteful number, since it uses less digits than its factorization.

1561601554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3439880.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 1561601554 is about 39517.1045751077. The cubic root of 1561601554 is about 1160.1747541912.

The spelling of 1561601554 in words is "one billion, five hundred sixty-one million, six hundred one thousand, five hundred fifty-four".