11651601 has 8 divisors (see below), whose sum is σ = 16730560. Its totient is φ = 7170192.

The previous prime is 11651599. The next prime is 11651611. The reversal of 11651601 is 10615611.

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

It is not a de Polignac number, because 11651601 - 2¹ = 11651599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11651611) 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, 149341 + ... + 149418.

It is an arithmetic number, because the mean of its divisors is an integer number (2091320).

Almost surely, 2^11651601 is an apocalyptic number.

It is an amenable number.

11651601 is a deficient number, since it is larger than the sum of its proper divisors (5078959).

11651601 is a wasteful number, since it uses less digits than its factorization.

11651601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298775.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 11651601 is about 3413.4441551020. Note that the first 3 decimals coincide. The cubic root of 11651601 is about 226.7054016367.

The spelling of 11651601 in words is "eleven million, six hundred fifty-one thousand, six hundred one".