11891129 has 2 divisors, whose sum is σ = 11891130. Its totient is φ = 11891128.

The previous prime is 11891119. The next prime is 11891153. The reversal of 11891129 is 92119811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11868025 + 23104 = 3445^2 + 152^2 .

It is a cyclic number.

It is not a de Polignac number, because 11891129 - 2⁸ = 11890873 is a prime.

It is equal to p₇₈₁₃₆₇ and since 11891129 and 781367 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 11891095 and 11891104.

It is not a weakly prime, because it can be changed into another prime (11891119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5945564 + 5945565.

It is an arithmetic number, because the mean of its divisors is an integer number (5945565).

Almost surely, 2^11891129 is an apocalyptic number.

It is an amenable number.

11891129 is a deficient number, since it is larger than the sum of its proper divisors (1).

11891129 is an equidigital number, since it uses as much as digits as its factorization.

11891129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 32.

The square root of 11891129 is about 3448.3516352020. The cubic root of 11891129 is about 228.2483763476.

The spelling of 11891129 in words is "eleven million, eight hundred ninety-one thousand, one hundred twenty-nine".