1691311155 has 32 divisors (see below), whose sum is σ = 2740193280. Its totient is φ = 890716800.

The previous prime is 1691311151. The next prime is 1691311177. The reversal of 1691311155 is 5511131961.

It is not a de Polignac number, because 1691311155 - 2² = 1691311151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1691311151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 663814 + ... + 666356.

It is an arithmetic number, because the mean of its divisors is an integer number (85631040).

Almost surely, 2^1691311155 is an apocalyptic number.

1691311155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1691311155 is a deficient number, since it is larger than the sum of its proper divisors (1048882125).

1691311155 is a wasteful number, since it uses less digits than its factorization.

1691311155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3091.

The product of its digits is 4050, while the sum is 33.

The square root of 1691311155 is about 41125.5535525055. The cubic root of 1691311155 is about 1191.4463864167.

The spelling of 1691311155 in words is "one billion, six hundred ninety-one million, three hundred eleven thousand, one hundred fifty-five".