11771551 has 16 divisors (see below), whose sum is σ = 13483008. Its totient is φ = 10180800.

The previous prime is 11771533. The next prime is 11771563. The reversal of 11771551 is 15517711.

It is a 6-Lehmer number, since φ(11771551) divides (11771551-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 11771551 - 2⁵ = 11771519 is a prime.

It is a deceptive number, since it divides R_11771550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11711551) 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, 19090 + ... + 19696.

It is an arithmetic number, because the mean of its divisors is an integer number (842688).

Almost surely, 2^11771551 is an apocalyptic number.

11771551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11771551 is a deficient number, since it is larger than the sum of its proper divisors (1711457).

11771551 is a wasteful number, since it uses less digits than its factorization.

11771551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702.

The product of its digits is 1225, while the sum is 28.

The square root of 11771551 is about 3430.9693965409. The cubic root of 11771551 is about 227.4807035922.

The spelling of 11771551 in words is "eleven million, seven hundred seventy-one thousand, five hundred fifty-one".