65396381 has 2 divisors, whose sum is σ = 65396382. Its totient is φ = 65396380.

The previous prime is 65396369. The next prime is 65396407. The reversal of 65396381 is 18369356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64947481 + 448900 = 8059^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 65396381 - 2²² = 61202077 is a prime.

It is a super-2 number, since 2×65396381² = 8553373295794322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65396351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32698190 + 32698191.

It is an arithmetic number, because the mean of its divisors is an integer number (32698191).

Almost surely, 2^65396381 is an apocalyptic number.

It is an amenable number.

65396381 is a deficient number, since it is larger than the sum of its proper divisors (1).

65396381 is an equidigital number, since it uses as much as digits as its factorization.

65396381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 41.

The square root of 65396381 is about 8086.8028911307. The cubic root of 65396381 is about 402.8882223191. Note that the first 3 decimals are identical.

The spelling of 65396381 in words is "sixty-five million, three hundred ninety-six thousand, three hundred eighty-one".