27801131 has 2 divisors, whose sum is σ = 27801132. Its totient is φ = 27801130.

The previous prime is 27801121. The next prime is 27801133. The reversal of 27801131 is 13110872.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27801131 - 2¹⁰ = 27800107 is a prime.

It is a super-2 number, since 2×27801131² = 1545805769758322, which contains 22 as substring.

Together with 27801133, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 27801097 and 27801106.

It is not a weakly prime, because it can be changed into another prime (27801133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13900565 + 13900566.

It is an arithmetic number, because the mean of its divisors is an integer number (13900566).

Almost surely, 2^27801131 is an apocalyptic number.

27801131 is a deficient number, since it is larger than the sum of its proper divisors (1).

27801131 is an equidigital number, since it uses as much as digits as its factorization.

27801131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 27801131 is about 5272.6777826831. The cubic root of 27801131 is about 302.9382796076.

The spelling of 27801131 in words is "twenty-seven million, eight hundred one thousand, one hundred thirty-one".