7121354391 has 6 divisors (see below), whose sum is σ = 10286400800. Its totient is φ = 4747569588.

The previous prime is 7121354377. The next prime is 7121354407. The reversal of 7121354391 is 1934531217.

7121354391 is a `hidden beast` number, since 7 + 1 + 21 + 3 + 543 + 91 = 666.

It is not a de Polignac number, because 7121354391 - 2⁷ = 7121354263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7121354321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 395630791 + ... + 395630808.

Almost surely, 2^7121354391 is an apocalyptic number.

7121354391 is a deficient number, since it is larger than the sum of its proper divisors (3165046409).

7121354391 is a wasteful number, since it uses less digits than its factorization.

7121354391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791261605 (or 791261602 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 7121354391 is about 84388.1175936518. The cubic root of 7121354391 is about 1923.9223194642.

The spelling of 7121354391 in words is "seven billion, one hundred twenty-one million, three hundred fifty-four thousand, three hundred ninety-one".