1561262002 has 8 divisors (see below), whose sum is σ = 2352120300. Its totient is φ = 777221904.

The previous prime is 1561261993. The next prime is 1561262033. The reversal of 1561262002 is 2002621651.

It can be written as a sum of positive squares in 2 ways, for example, as 1123657441 + 437604561 = 33521^2 + 20919^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 1703977 + ... + 1704892.

Almost surely, 2^1561262002 is an apocalyptic number.

1561262002 is a deficient number, since it is larger than the sum of its proper divisors (790858298).

1561262002 is a wasteful number, since it uses less digits than its factorization.

1561262002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3409100.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1561262002 is about 39512.8080753570. The cubic root of 1561262002 is about 1160.0906592838.

Adding to 1561262002 its reverse (2002621651), we get a palindrome (3563883653).

The spelling of 1561262002 in words is "one billion, five hundred sixty-one million, two hundred sixty-two thousand, two".