1361131505 has 8 divisors (see below), whose sum is σ = 1648343400. Its totient is φ = 1078914816.

The previous prime is 1361131493. The next prime is 1361131523. The reversal of 1361131505 is 5051311631.

It can be written as a sum of positive squares in 4 ways, for example, as 693374224 + 667757281 = 26332^2 + 25841^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1361131505 - 2²² = 1356937201 is a prime.

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, 1248200 + ... + 1249289.

It is an arithmetic number, because the mean of its divisors is an integer number (206042925).

Almost surely, 2^1361131505 is an apocalyptic number.

It is an amenable number.

1361131505 is a deficient number, since it is larger than the sum of its proper divisors (287211895).

1361131505 is a wasteful number, since it uses less digits than its factorization.

1361131505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497603.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 1361131505 is about 36893.5157581925. The cubic root of 1361131505 is about 1108.2388284820.

The spelling of 1361131505 in words is "one billion, three hundred sixty-one million, one hundred thirty-one thousand, five hundred five".