1691101129 has 27 divisors (see below), whose sum is σ = 1873050901. Its totient is φ = 1526485760.

The previous prime is 1691101117. The next prime is 1691101133. The reversal of 1691101129 is 9211011961.

The square root of 1691101129 is 41123.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 119137225 + 1571963904 = 10915^2 + 39648^2 .

It is not a de Polignac number, because 1691101129 - 2¹⁵ = 1691068361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1691101129.

It is not an unprimeable number, because it can be changed into a prime (1691101229) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 28662702 + ... + 28662760.

Almost surely, 2^1691101129 is an apocalyptic number.

1691101129 is the 41123-rd square number.

1691101129 is the 20562-nd centered octagonal number.

It is an amenable number.

1691101129 is a deficient number, since it is larger than the sum of its proper divisors (181949772).

1691101129 is an frugal number, since it uses more digits than its factorization.

1691101129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 31.

The cubic root of 1691101129 is about 1191.3970666770.

The spelling of 1691101129 in words is "one billion, six hundred ninety-one million, one hundred one thousand, one hundred twenty-nine".