11899551 has 4 divisors (see below), whose sum is σ = 15866072. Its totient is φ = 7933032.

The previous prime is 11899549. The next prime is 11899583. The reversal of 11899551 is 15599811.

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

It is not a de Polignac number, because 11899551 - 2¹ = 11899549 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 (11899051) 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, 1983256 + ... + 1983261.

It is an arithmetic number, because the mean of its divisors is an integer number (3966518).

Almost surely, 2^11899551 is an apocalyptic number.

11899551 is a deficient number, since it is larger than the sum of its proper divisors (3966521).

11899551 is an equidigital number, since it uses as much as digits as its factorization.

11899551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3966520.

The product of its digits is 16200, while the sum is 39.

The square root of 11899551 is about 3449.5725822194. The cubic root of 11899551 is about 228.3022499586.

The spelling of 11899551 in words is "eleven million, eight hundred ninety-nine thousand, five hundred fifty-one".