6401209397 has 6 divisors (see below), whose sum is σ = 7036040214. Its totient is φ = 5819281160.

The previous prime is 6401209391. The next prime is 6401209403. The reversal of 6401209397 is 7939021046.

It is an interprime number because it is at equal distance from previous prime (6401209391) and next prime (6401209403).

It can be written as a sum of positive squares in only one way, i.e., 3359245681 + 3041963716 = 57959^2 + 55154^2 .

It is not a de Polignac number, because 6401209397 - 2⁶ = 6401209333 is a prime.

It is a super-2 number, since 2×6401209397² = 81950963488482207218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401209391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26451158 + ... + 26451399.

It is an arithmetic number, because the mean of its divisors is an integer number (1172673369).

Almost surely, 2^6401209397 is an apocalyptic number.

It is an amenable number.

6401209397 is a deficient number, since it is larger than the sum of its proper divisors (634830817).

6401209397 is a wasteful number, since it uses less digits than its factorization.

6401209397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52902579 (or 52902568 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 6401209397 is about 80007.5583741936. The cubic root of 6401209397 is about 1856.7524744879.

The spelling of 6401209397 in words is "six billion, four hundred one million, two hundred nine thousand, three hundred ninety-seven".