6401129381 has 2 divisors, whose sum is σ = 6401129382. Its totient is φ = 6401129380.

The previous prime is 6401129369. The next prime is 6401129401. The reversal of 6401129381 is 1839211046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4336881025 + 2064248356 = 65855^2 + 45434^2 .

It is a cyclic number.

It is not a de Polignac number, because 6401129381 - 2³⁰ = 5327387557 is a prime.

It is a super-2 number, since 2×6401129381² = 81948914704602886322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6401129341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200564690 + 3200564691.

It is an arithmetic number, because the mean of its divisors is an integer number (3200564691).

Almost surely, 2^6401129381 is an apocalyptic number.

It is an amenable number.

6401129381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401129381 is an equidigital number, since it uses as much as digits as its factorization.

6401129381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 6401129381 is about 80007.0583198758. The cubic root of 6401129381 is about 1856.7447379017.

The spelling of 6401129381 in words is "six billion, four hundred one million, one hundred twenty-nine thousand, three hundred eighty-one".