65129381 has 2 divisors, whose sum is σ = 65129382. Its totient is φ = 65129380.

The previous prime is 65129371. The next prime is 65129437. The reversal of 65129381 is 18392156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61481281 + 3648100 = 7841^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 65129381 - 2¹⁴ = 65112997 is a prime.

It is a super-2 number, since 2×65129381² = 8483672538886322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65129371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32564690 + 32564691.

It is an arithmetic number, because the mean of its divisors is an integer number (32564691).

Almost surely, 2^65129381 is an apocalyptic number.

It is an amenable number.

65129381 is a deficient number, since it is larger than the sum of its proper divisors (1).

65129381 is an equidigital number, since it uses as much as digits as its factorization.

65129381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 65129381 is about 8070.2776284339. The cubic root of 65129381 is about 402.3391711144.

The spelling of 65129381 in words is "sixty-five million, one hundred twenty-nine thousand, three hundred eighty-one".