11551990 has 16 divisors (see below), whose sum is σ = 20979648. Its totient is φ = 4579456.

The previous prime is 11551979. The next prime is 11551999. The reversal of 11551990 is 9915511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3982 + ... + 6241.

It is an arithmetic number, because the mean of its divisors is an integer number (1311228).

Almost surely, 2^11551990 is an apocalyptic number.

11551990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11551990 is a deficient number, since it is larger than the sum of its proper divisors (9427658).

11551990 is a wasteful number, since it uses less digits than its factorization.

11551990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10343.

The product of its (nonzero) digits is 2025, while the sum is 31.

The square root of 11551990 is about 3398.8218547020. The cubic root of 11551990 is about 226.0575074894.

The spelling of 11551990 in words is "eleven million, five hundred fifty-one thousand, nine hundred ninety".