1211161659 has 16 divisors (see below), whose sum is σ = 1652210688. Its totient is φ = 788838912.

The previous prime is 1211161639. The next prime is 1211161667. The reversal of 1211161659 is 9561611121.

It is not a de Polignac number, because 1211161659 - 2¹⁶ = 1211096123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211161639) 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, 73914 + ... + 88800.

It is an arithmetic number, because the mean of its divisors is an integer number (103263168).

Almost surely, 2^1211161659 is an apocalyptic number.

1211161659 is a deficient number, since it is larger than the sum of its proper divisors (441049029).

1211161659 is a wasteful number, since it uses less digits than its factorization.

1211161659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15514.

The product of its digits is 3240, while the sum is 33.

The square root of 1211161659 is about 34801.7479302405. The cubic root of 1211161659 is about 1065.9431377315.

The spelling of 1211161659 in words is "one billion, two hundred eleven million, one hundred sixty-one thousand, six hundred fifty-nine".