2091199551 has 16 divisors (see below), whose sum is σ = 3205676544. Its totient is φ = 1187813664.

The previous prime is 2091199543. The next prime is 2091199567. The reversal of 2091199551 is 1559911902.

It is not a de Polignac number, because 2091199551 - 2³ = 2091199543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091199531) 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, 294640 + ... + 301653.

It is an arithmetic number, because the mean of its divisors is an integer number (200354784).

Almost surely, 2^2091199551 is an apocalyptic number.

2091199551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2091199551 is a deficient number, since it is larger than the sum of its proper divisors (1114476993).

2091199551 is a wasteful number, since it uses less digits than its factorization.

2091199551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596470.

The product of its (nonzero) digits is 36450, while the sum is 42.

The square root of 2091199551 is about 45729.6353692001. The cubic root of 2091199551 is about 1278.7878235664.

The spelling of 2091199551 in words is "two billion, ninety-one million, one hundred ninety-nine thousand, five hundred fifty-one".