27631381 has 2 divisors, whose sum is σ = 27631382. Its totient is φ = 27631380.

The previous prime is 27631367. The next prime is 27631423. The reversal of 27631381 is 18313672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25100100 + 2531281 = 5010^2 + 1591^2 .

It is a cyclic number.

It is not a de Polignac number, because 27631381 - 2¹¹ = 27629333 is a prime.

It is a super-2 number, since 2×27631381² = 1526986431934322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27631321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13815690 + 13815691.

It is an arithmetic number, because the mean of its divisors is an integer number (13815691).

Almost surely, 2^27631381 is an apocalyptic number.

It is an amenable number.

27631381 is a deficient number, since it is larger than the sum of its proper divisors (1).

27631381 is an equidigital number, since it uses as much as digits as its factorization.

27631381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 27631381 is about 5256.5560017943. The cubic root of 27631381 is about 302.3204535237.

It can be divided in two parts, 2763 and 1381, that multiplied together give a triangular number (3815703 = T₂₇₆₂).

The spelling of 27631381 in words is "twenty-seven million, six hundred thirty-one thousand, three hundred eighty-one".