6401121151 has 4 divisors (see below), whose sum is σ = 6406088400. Its totient is φ = 6396153904.

The previous prime is 6401121131. The next prime is 6401121173. The reversal of 6401121151 is 1511211046.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6401121151 - 2¹³ = 6401112959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401121131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2481691 + ... + 2484268.

It is an arithmetic number, because the mean of its divisors is an integer number (1601522100).

Almost surely, 2^6401121151 is an apocalyptic number.

6401121151 is a deficient number, since it is larger than the sum of its proper divisors (4967249).

6401121151 is a wasteful number, since it uses less digits than its factorization.

6401121151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4967248.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 6401121151 is about 80007.0068868971. The cubic root of 6401121151 is about 1856.7439421559.

Adding to 6401121151 its reverse (1511211046), we get a palindrome (7912332197).

The spelling of 6401121151 in words is "six billion, four hundred one million, one hundred twenty-one thousand, one hundred fifty-one".