1161726505 has 16 divisors (see below), whose sum is σ = 1403236224. Its totient is φ = 923294080.

The previous prime is 1161726491. The next prime is 1161726509. The reversal of 1161726505 is 5056271611.

It is not a de Polignac number, because 1161726505 - 2⁵ = 1161726473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161726509) 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, 538509 + ... + 540661.

It is an arithmetic number, because the mean of its divisors is an integer number (87702264).

Almost surely, 2^1161726505 is an apocalyptic number.

It is an amenable number.

1161726505 is a deficient number, since it is larger than the sum of its proper divisors (241509719).

1161726505 is a wasteful number, since it uses less digits than its factorization.

1161726505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 1161726505 is about 34084.1092739711. The cubic root of 1161726505 is about 1051.2386003289.

The spelling of 1161726505 in words is "one billion, one hundred sixty-one million, seven hundred twenty-six thousand, five hundred five".