1561430101 has 24 divisors (see below), whose sum is σ = 2009351232. Its totient is φ = 1186996800.

The previous prime is 1561430071. The next prime is 1561430119. The reversal of 1561430101 is 1010341651.

It is a de Polignac number, because none of the positive numbers 2^k-1561430101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561430131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12246 + ... + 57208.

It is an arithmetic number, because the mean of its divisors is an integer number (83722968).

Almost surely, 2^1561430101 is an apocalyptic number.

1561430101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1561430101 is a deficient number, since it is larger than the sum of its proper divisors (447921131).

1561430101 is a wasteful number, since it uses less digits than its factorization.

1561430101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45033 (or 45022 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1561430101 is about 39514.9351638086. The cubic root of 1561430101 is about 1160.1322929282.

Adding to 1561430101 its reverse (1010341651), we get a palindrome (2571771752).

The spelling of 1561430101 in words is "one billion, five hundred sixty-one million, four hundred thirty thousand, one hundred one".