1355121391 has 8 divisors (see below), whose sum is σ = 1545206544. Its totient is φ = 1177299840.

The previous prime is 1355121379. The next prime is 1355121409. The reversal of 1355121391 is 1931215531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1355121391 - 2⁵ = 1355121359 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 (1355121311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3065665 + ... + 3066106.

It is an arithmetic number, because the mean of its divisors is an integer number (193150818).

Almost surely, 2^1355121391 is an apocalyptic number.

1355121391 is a deficient number, since it is larger than the sum of its proper divisors (190085153).

1355121391 is a wasteful number, since it uses less digits than its factorization.

1355121391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6131801.

The product of its digits is 4050, while the sum is 31.

The square root of 1355121391 is about 36811.9734733144. The cubic root of 1355121391 is about 1106.6052686558.

The spelling of 1355121391 in words is "one billion, three hundred fifty-five million, one hundred twenty-one thousand, three hundred ninety-one".