1354865991 has 8 divisors (see below), whose sum is σ = 1885031040. Its totient is φ = 863972472.

The previous prime is 1354865971. The next prime is 1354865999. The reversal of 1354865991 is 1995684531.

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

It is not a de Polignac number, because 1354865991 - 2⁵ = 1354865959 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1354865999) 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, 9817801 + ... + 9817938.

It is an arithmetic number, because the mean of its divisors is an integer number (235628880).

Almost surely, 2^1354865991 is an apocalyptic number.

1354865991 is a deficient number, since it is larger than the sum of its proper divisors (530165049).

1354865991 is a wasteful number, since it uses less digits than its factorization.

1354865991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19635765.

The product of its digits is 1166400, while the sum is 51.

The square root of 1354865991 is about 36808.5043298420. The cubic root of 1354865991 is about 1106.5357435823.

The spelling of 1354865991 in words is "one billion, three hundred fifty-four million, eight hundred sixty-five thousand, nine hundred ninety-one".