11345551 has 12 divisors (see below), whose sum is σ = 13238512. Its totient is φ = 9524736.

The previous prime is 11345549. The next prime is 11345563. The reversal of 11345551 is 15554311.

It is a happy number.

It is not a de Polignac number, because 11345551 - 2¹ = 11345549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11345501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19375 + ... + 19951.

Almost surely, 2^11345551 is an apocalyptic number.

11345551 is a deficient number, since it is larger than the sum of its proper divisors (1892961).

11345551 is an frugal number, since it uses more digits than its factorization.

11345551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690 (or 637 counting only the distinct ones).

The product of its digits is 1500, while the sum is 25.

The square root of 11345551 is about 3368.3157512324. The cubic root of 11345551 is about 224.7028241293.

Adding to 11345551 its reverse (15554311), we get a palindrome (26899862).

The spelling of 11345551 in words is "eleven million, three hundred forty-five thousand, five hundred fifty-one".