16311691 has 8 divisors (see below), whose sum is σ = 17833968. Its totient is φ = 14796000.

The previous prime is 16311689. The next prime is 16311707. The reversal of 16311691 is 19611361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16311691 - 2¹ = 16311689 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (16311661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4581 + ... + 7321.

It is an arithmetic number, because the mean of its divisors is an integer number (2229246).

Almost surely, 2^16311691 is an apocalyptic number.

16311691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16311691 is a deficient number, since it is larger than the sum of its proper divisors (1522277).

16311691 is a wasteful number, since it uses less digits than its factorization.

16311691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3293.

The product of its digits is 972, while the sum is 28.

The square root of 16311691 is about 4038.7734524234. The cubic root of 16311691 is about 253.6099734606.

The spelling of 16311691 in words is "sixteen million, three hundred eleven thousand, six hundred ninety-one".