356109615491 has 4 divisors (see below), whose sum is σ = 406982417712. Its totient is φ = 305236813272.

The previous prime is 356109615473. The next prime is 356109615527. The reversal of 356109615491 is 194516901653.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194516901653 = 31 ⋅6274738763.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-356109615491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (356109615401) 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, 25436401100 + ... + 25436401113.

It is an arithmetic number, because the mean of its divisors is an integer number (101745604428).

Almost surely, 2^356109615491 is an apocalyptic number.

356109615491 is a deficient number, since it is larger than the sum of its proper divisors (50872802221).

356109615491 is an equidigital number, since it uses as much as digits as its factorization.

356109615491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50872802220.

The product of its (nonzero) digits is 874800, while the sum is 50.

The spelling of 356109615491 in words is "three hundred fifty-six billion, one hundred nine million, six hundred fifteen thousand, four hundred ninety-one".