401321756139 has 4 divisors (see below), whose sum is σ = 535095674856. Its totient is φ = 267547837424.

The previous prime is 401321756089. The next prime is 401321756183. The reversal of 401321756139 is 931657123104.

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 401321756139 - 2¹⁹ = 401321231851 is a prime.

It is a super-2 number, since 2×401321756139² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401321756139.

It is not an unprimeable number, because it can be changed into a prime (401321716139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66886959354 + ... + 66886959359.

It is an arithmetic number, because the mean of its divisors is an integer number (133773918714).

Almost surely, 2^401321756139 is an apocalyptic number.

401321756139 is a deficient number, since it is larger than the sum of its proper divisors (133773918717).

401321756139 is a wasteful number, since it uses less digits than its factorization.

401321756139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133773918716.

The product of its (nonzero) digits is 136080, while the sum is 42.

The spelling of 401321756139 in words is "four hundred one billion, three hundred twenty-one million, seven hundred fifty-six thousand, one hundred thirty-nine".