1561245002 has 16 divisors (see below), whose sum is σ = 2419732224. Its totient is φ = 754716000.

The previous prime is 1561244983. The next prime is 1561245043. The reversal of 1561245002 is 2005421651.

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, 56102 + ... + 79182.

It is an arithmetic number, because the mean of its divisors is an integer number (151233264).

Almost surely, 2^1561245002 is an apocalyptic number.

1561245002 is a deficient number, since it is larger than the sum of its proper divisors (858487222).

1561245002 is a wasteful number, since it uses less digits than its factorization.

1561245002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24205.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1561245002 is about 39512.5929546518. The cubic root of 1561245002 is about 1160.0864486702.

Adding to 1561245002 its reverse (2005421651), we get a palindrome (3566666653).

The spelling of 1561245002 in words is "one billion, five hundred sixty-one million, two hundred forty-five thousand, two".