11509651 has 2 divisors, whose sum is σ = 11509652. Its totient is φ = 11509650.

The previous prime is 11509633. The next prime is 11509679. The reversal of 11509651 is 15690511.

It is an a-pointer prime, because the next prime (11509679) can be obtained adding 11509651 to its sum of digits (28).

It is a weak prime.

It is an emirp because it is prime and its reverse (15690511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11509651 - 2¹⁷ = 11378579 is a prime.

It is a super-2 number, since 2×11509651² = 264944132283602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11509621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5754825 + 5754826.

It is an arithmetic number, because the mean of its divisors is an integer number (5754826).

Almost surely, 2^11509651 is an apocalyptic number.

11509651 is a deficient number, since it is larger than the sum of its proper divisors (1).

11509651 is an equidigital number, since it uses as much as digits as its factorization.

11509651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 11509651 is about 3392.5876554630. The cubic root of 11509651 is about 225.7809962398.

It can be divided in two parts, 1150 and 9651, that added together give a palindrome (10801).

The spelling of 11509651 in words is "eleven million, five hundred nine thousand, six hundred fifty-one".