1561051506 has 48 divisors (see below), whose sum is σ = 3700396224. Its totient is φ = 437594976.

The previous prime is 1561051493. The next prime is 1561051519. The reversal of 1561051506 is 6051501651.

It is an interprime number because it is at equal distance from previous prime (1561051493) and next prime (1561051519).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34510 + ... + 65673.

It is an arithmetic number, because the mean of its divisors is an integer number (77091588).

Almost surely, 2^1561051506 is an apocalyptic number.

1561051506 is an abundant number, since it is smaller than the sum of its proper divisors (2139344718).

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

1561051506 is a wasteful number, since it uses less digits than its factorization.

1561051506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100255 (or 100248 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 1561051506 is about 39510.1443429406. The cubic root of 1561051506 is about 1160.0385208175.

The spelling of 1561051506 in words is "one billion, five hundred sixty-one million, fifty-one thousand, five hundred six".