1561161432 has 32 divisors (see below), whose sum is σ = 4072596480. Its totient is φ = 497761440.

The previous prime is 1561161431. The next prime is 1561161449. The reversal of 1561161432 is 2341611651.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1561161432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561161431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1413544 + ... + 1414647.

It is an arithmetic number, because the mean of its divisors is an integer number (127268640).

Almost surely, 2^1561161432 is an apocalyptic number.

1561161432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561161432 is an abundant number, since it is smaller than the sum of its proper divisors (2511435048).

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

1561161432 is a wasteful number, since it uses less digits than its factorization.

1561161432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828223 (or 2828219 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 1561161432 is about 39511.5354295426. The cubic root of 1561161432 is about 1160.0657493450.

The spelling of 1561161432 in words is "one billion, five hundred sixty-one million, one hundred sixty-one thousand, four hundred thirty-two".