11401251551 has 4 divisors (see below), whose sum is σ = 11408217912. Its totient is φ = 11394285192.

The previous prime is 11401251529. The next prime is 11401251577. The reversal of 11401251551 is 15515210411.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15515210411 = 113 ⋅137302747.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11401251551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11401251551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11401256551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3480725 + ... + 3483998.

It is an arithmetic number, because the mean of its divisors is an integer number (2852054478).

Almost surely, 2^11401251551 is an apocalyptic number.

11401251551 is a deficient number, since it is larger than the sum of its proper divisors (6966361).

11401251551 is an equidigital number, since it uses as much as digits as its factorization.

11401251551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6966360.

The product of its (nonzero) digits is 1000, while the sum is 26.

Adding to 11401251551 its reverse (15515210411), we get a palindrome (26916461962).

The spelling of 11401251551 in words is "eleven billion, four hundred one million, two hundred fifty-one thousand, five hundred fifty-one".