10991401 has 8 divisors (see below), whose sum is σ = 12144384. Its totient is φ = 9894720.

The previous prime is 10991399. The next prime is 10991423. The reversal of 10991401 is 10419901.

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 10991401 - 2¹ = 10991399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10991471) 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, 13665 + ... + 14446.

It is an arithmetic number, because the mean of its divisors is an integer number (1518048).

Almost surely, 2^10991401 is an apocalyptic number.

It is an amenable number.

10991401 is a deficient number, since it is larger than the sum of its proper divisors (1152983).

10991401 is a wasteful number, since it uses less digits than its factorization.

10991401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28151.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 10991401 is about 3315.3281888827. The cubic root of 10991401 is about 222.3400424199.

It can be divided in two parts, 1099 and 1401, that added together give a square (2500 = 50²).

The spelling of 10991401 in words is "ten million, nine hundred ninety-one thousand, four hundred one".