1001561562 has 48 divisors (see below), whose sum is σ = 2335410792. Its totient is φ = 309058560.

The previous prime is 1001561557. The next prime is 1001561591. The reversal of 1001561562 is 2651651001.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 841058001 + 160503561 = 29001^2 + 12669^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8163 + ... + 45494.

Almost surely, 2^1001561562 is an apocalyptic number.

1001561562 is an abundant number, since it is smaller than the sum of its proper divisors (1333849230).

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

1001561562 is a wasteful number, since it uses less digits than its factorization.

1001561562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53743 (or 53740 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1001561562 is about 31647.4574334179. The cubic root of 1001561562 is about 1000.5202499597.

The spelling of 1001561562 in words is "one billion, one million, five hundred sixty-one thousand, five hundred sixty-two".