1081691154 has 24 divisors (see below), whose sum is σ = 2344445532. Its totient is φ = 360443520.

The previous prime is 1081691129. The next prime is 1081691161. The reversal of 1081691154 is 4511961801.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 971755929 + 109935225 = 31173^2 + 10485^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57934 + ... + 74294.

Almost surely, 2^1081691154 is an apocalyptic number.

1081691154 is an abundant number, since it is smaller than the sum of its proper divisors (1262754378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1081691154 is a wasteful number, since it uses less digits than its factorization.

1081691154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20042 (or 20039 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 36.

The square root of 1081691154 is about 32889.0734743319. The cubic root of 1081691154 is about 1026.5208132930.

The spelling of 1081691154 in words is "one billion, eighty-one million, six hundred ninety-one thousand, one hundred fifty-four".