1561262000 has 40 divisors (see below), whose sum is σ = 3775136352. Its totient is φ = 624504000.

The previous prime is 1561261993. The next prime is 1561262033. The reversal of 1561262000 is 2621651.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388316 + ... + 392315.

Almost surely, 2^1561262000 is an apocalyptic number.

1561262000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561262000 is an abundant number, since it is smaller than the sum of its proper divisors (2213874352).

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

1561262000 is an equidigital number, since it uses as much as digits as its factorization.

1561262000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780654 (or 780638 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1561262000 is about 39512.8080500488. The cubic root of 1561262000 is about 1160.0906587884.

Adding to 1561262000 its reverse (2621651), we get a palindrome (1563883651).

The spelling of 1561262000 in words is "one billion, five hundred sixty-one million, two hundred sixty-two thousand".