11987953 has 2 divisors, whose sum is σ = 11987954. Its totient is φ = 11987952.

The previous prime is 11987951. The next prime is 11987957. The reversal of 11987953 is 35978911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7463824 + 4524129 = 2732^2 + 2127^2 .

It is a cyclic number.

It is not a de Polignac number, because 11987953 - 2¹ = 11987951 is a prime.

It is a super-2 number, since 2×11987953² = 287422034260418, which contains 22 as substring.

Together with 11987951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11987951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5993976 + 5993977.

It is an arithmetic number, because the mean of its divisors is an integer number (5993977).

Almost surely, 2^11987953 is an apocalyptic number.

It is an amenable number.

11987953 is a deficient number, since it is larger than the sum of its proper divisors (1).

11987953 is an equidigital number, since it uses as much as digits as its factorization.

11987953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 43.

The square root of 11987953 is about 3462.3623438340. The cubic root of 11987953 is about 228.8662096782.

The spelling of 11987953 in words is "eleven million, nine hundred eighty-seven thousand, nine hundred fifty-three".