52991987 has 2 divisors, whose sum is σ = 52991988. Its totient is φ = 52991986.

The previous prime is 52991951. The next prime is 52991993. The reversal of 52991987 is 78919925.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 52991987 - 2¹⁴ = 52975603 is a prime.

It is not a weakly prime, because it can be changed into another prime (52991947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26495993 + 26495994.

It is an arithmetic number, because the mean of its divisors is an integer number (26495994).

Almost surely, 2^52991987 is an apocalyptic number.

52991987 is a deficient number, since it is larger than the sum of its proper divisors (1).

52991987 is an equidigital number, since it uses as much as digits as its factorization.

52991987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 50.

The square root of 52991987 is about 7279.5595333784. The cubic root of 52991987 is about 375.6096442053.

It can be divided in two parts, 5 and 2991987, that added together give a palindrome (2991992).

The spelling of 52991987 in words is "fifty-two million, nine hundred ninety-one thousand, nine hundred eighty-seven".