1561151505 has 16 divisors (see below), whose sum is σ = 2540180160. Its totient is φ = 818501568.

The previous prime is 1561151503. The next prime is 1561151513. The reversal of 1561151505 is 5051511651.

It is not a de Polignac number, because 1561151505 - 2¹ = 1561151503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561151503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 881122 + ... + 882891.

It is an arithmetic number, because the mean of its divisors is an integer number (158761260).

Almost surely, 2^1561151505 is an apocalyptic number.

1561151505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561151505 is a deficient number, since it is larger than the sum of its proper divisors (979028655).

1561151505 is a wasteful number, since it uses less digits than its factorization.

1561151505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764080.

The product of its (nonzero) digits is 3750, while the sum is 30.

The square root of 1561151505 is about 39511.4098078011. The cubic root of 1561151505 is about 1160.0632904925.

The spelling of 1561151505 in words is "one billion, five hundred sixty-one million, one hundred fifty-one thousand, five hundred five".