11931487 has 4 divisors (see below), whose sum is σ = 12559480. Its totient is φ = 11303496.

The previous prime is 11931461. The next prime is 11931509. The reversal of 11931487 is 78413911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11931487 - 2¹¹ = 11929439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11931407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313968 + ... + 314005.

It is an arithmetic number, because the mean of its divisors is an integer number (3139870).

Almost surely, 2^11931487 is an apocalyptic number.

11931487 is a deficient number, since it is larger than the sum of its proper divisors (627993).

11931487 is an equidigital number, since it uses as much as digits as its factorization.

11931487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627992.

The product of its digits is 6048, while the sum is 34.

The square root of 11931487 is about 3454.1984598456. The cubic root of 11931487 is about 228.5063066154.

It can be divided in two parts, 119 and 31487, that multiplied together give a triangular number (3746953 = T₂₇₃₇).

The spelling of 11931487 in words is "eleven million, nine hundred thirty-one thousand, four hundred eighty-seven".