1161206553531 has 16 divisors (see below), whose sum is σ = 1582675528320. Its totient is φ = 757073610240.

The previous prime is 1161206553523. The next prime is 1161206553541. The reversal of 1161206553531 is 1353556021611.

It is not a de Polignac number, because 1161206553531 - 2³ = 1161206553523 is a prime.

It is a super-2 number, since 2×1161206553531² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1161206553531.

It is not an unprimeable number, because it can be changed into a prime (1161206553541) 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, 16961925 + ... + 17030246.

It is an arithmetic number, because the mean of its divisors is an integer number (98917220520).

Almost surely, 2^{1161206553531} is an apocalyptic number.

1161206553531 is a deficient number, since it is larger than the sum of its proper divisors (421468974789).

1161206553531 is a wasteful number, since it uses less digits than its factorization.

1161206553531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33992426.

The product of its (nonzero) digits is 81000, while the sum is 39.

The spelling of 1161206553531 in words is "one trillion, one hundred sixty-one billion, two hundred six million, five hundred fifty-three thousand, five hundred thirty-one".