133773431 has 16 divisors (see below), whose sum is σ = 149415840. Its totient is φ = 118734720.

The previous prime is 133773407. The next prime is 133773439. The reversal of 133773431 is 134377331.

It is a cyclic number.

It is not a de Polignac number, because 133773431 - 2²⁶ = 66664567 is a prime.

It is a super-2 number, since 2×133773431² = 35790661683023522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133773439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156401 + ... + 157253.

It is an arithmetic number, because the mean of its divisors is an integer number (9338490).

Almost surely, 2^133773431 is an apocalyptic number.

133773431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

133773431 is a deficient number, since it is larger than the sum of its proper divisors (15642409).

133773431 is a wasteful number, since it uses less digits than its factorization.

133773431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186.

The product of its digits is 15876, while the sum is 32.

The square root of 133773431 is about 11566.0464723258. The cubic root of 133773431 is about 511.4344226184.

The spelling of 133773431 in words is "one hundred thirty-three million, seven hundred seventy-three thousand, four hundred thirty-one".