391379454137 has 4 divisors (see below), whose sum is σ = 447290804736. Its totient is φ = 335468103540.

The previous prime is 391379454097. The next prime is 391379454143. The reversal of 391379454137 is 731454973193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 391379454137 - 2¹² = 391379450041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391379454157) 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, 27955675289 + ... + 27955675302.

It is an arithmetic number, because the mean of its divisors is an integer number (111822701184).

Almost surely, 2^391379454137 is an apocalyptic number.

It is an amenable number.

391379454137 is a deficient number, since it is larger than the sum of its proper divisors (55911350599).

391379454137 is an equidigital number, since it uses as much as digits as its factorization.

391379454137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55911350598.

The product of its digits is 8573040, while the sum is 56.

The spelling of 391379454137 in words is "three hundred ninety-one billion, three hundred seventy-nine million, four hundred fifty-four thousand, one hundred thirty-seven".