391290126377 has 4 divisors (see below), whose sum is σ = 401865535236. Its totient is φ = 380714717520.

The previous prime is 391290126361. The next prime is 391290126467. The reversal of 391290126377 is 773621092193.

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 353054625856 + 38235500521 = 594184^2 + 195539^2 .

It is not a de Polignac number, because 391290126377 - 2⁴ = 391290126361 is a prime.

It is a super-2 number, since 2×391290126377² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391290126317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5287704374 + ... + 5287704447.

It is an arithmetic number, because the mean of its divisors is an integer number (100466383809).

Almost surely, 2^391290126377 is an apocalyptic number.

391290126377 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

391290126377 is a deficient number, since it is larger than the sum of its proper divisors (10575408859).

391290126377 is a wasteful number, since it uses less digits than its factorization.

391290126377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10575408858.

The product of its (nonzero) digits is 857304, while the sum is 50.

The spelling of 391290126377 in words is "three hundred ninety-one billion, two hundred ninety million, one hundred twenty-six thousand, three hundred seventy-seven".