1561092640 has 48 divisors (see below), whose sum is σ = 3773867328. Its totient is φ = 609912576.

The previous prime is 1561092613. The next prime is 1561092647. The reversal of 1561092640 is 462901651.

It is a junction number, because it is equal to n+sod(n) for n = 1561092596 and 1561092605.

It is not an unprimeable number, because it can be changed into a prime (1561092647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106572 + ... + 120331.

It is an arithmetic number, because the mean of its divisors is an integer number (78622236).

Almost surely, 2^1561092640 is an apocalyptic number.

1561092640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561092640 is an abundant number, since it is smaller than the sum of its proper divisors (2212774688).

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

1561092640 is a wasteful number, since it uses less digits than its factorization.

1561092640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226961 (or 226953 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 1561092640 is about 39510.6648893688. The cubic root of 1561092640 is about 1160.0487098056.

The spelling of 1561092640 in words is "one billion, five hundred sixty-one million, ninety-two thousand, six hundred forty".