52251781 has 4 divisors (see below), whose sum is σ = 52444864. Its totient is φ = 52058700.

The previous prime is 52251779. The next prime is 52251803. The reversal of 52251781 is 18715225.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 52251781 - 2¹ = 52251779 is a prime.

It is a super-2 number, since 2×52251781² = 5460497235343922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52251701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96135 + ... + 96676.

It is an arithmetic number, because the mean of its divisors is an integer number (13111216).

Almost surely, 2^52251781 is an apocalyptic number.

It is an amenable number.

52251781 is a deficient number, since it is larger than the sum of its proper divisors (193083).

52251781 is a wasteful number, since it uses less digits than its factorization.

52251781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193082.

The product of its digits is 5600, while the sum is 31.

The square root of 52251781 is about 7228.5393406967. The cubic root of 52251781 is about 373.8525661171.

The spelling of 52251781 in words is "fifty-two million, two hundred fifty-one thousand, seven hundred eighty-one".