1561241400 has 96 divisors (see below), whose sum is σ = 5094614400. Its totient is φ = 394416000.

The previous prime is 1561241399. The next prime is 1561241411. The reversal of 1561241400 is 41421651.

It is a happy number.

1561241400 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57076 + ... + 79875.

It is an arithmetic number, because the mean of its divisors is an integer number (53068900).

Almost surely, 2^1561241400 is an apocalyptic number.

1561241400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561241400 is an abundant number, since it is smaller than the sum of its proper divisors (3533373000).

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

1561241400 is a wasteful number, since it uses less digits than its factorization.

1561241400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136989 (or 136980 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1561241400 is about 39512.5473742203. The cubic root of 1561241400 is about 1160.0855565116.

The spelling of 1561241400 in words is "one billion, five hundred sixty-one million, two hundred forty-one thousand, four hundred".