6391187401 has 4 divisors (see below), whose sum is σ = 6393278404. Its totient is φ = 6389096400.

The previous prime is 6391187273. The next prime is 6391187431. The reversal of 6391187401 is 1047811936.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2818017225 + 3573170176 = 53085^2 + 59776^2 .

It is a cyclic number.

It is not a de Polignac number, because 6391187401 - 2⁷ = 6391187273 is a prime.

It is a super-2 number, since 2×6391187401² = 81694552789402269602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6391187431) 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, 1040910 + ... + 1047031.

It is an arithmetic number, because the mean of its divisors is an integer number (1598319601).

Almost surely, 2^6391187401 is an apocalyptic number.

It is an amenable number.

6391187401 is a deficient number, since it is larger than the sum of its proper divisors (2091003).

6391187401 is a wasteful number, since it uses less digits than its factorization.

6391187401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091002.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 6391187401 is about 79944.9022827597. The cubic root of 6391187401 is about 1855.7829657324.

The spelling of 6391187401 in words is "six billion, three hundred ninety-one million, one hundred eighty-seven thousand, four hundred one".