731256133 has 2 divisors, whose sum is σ = 731256134. Its totient is φ = 731256132.

The previous prime is 731256103. The next prime is 731256137. The reversal of 731256133 is 331652137.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 690270529 + 40985604 = 26273^2 + 6402^2 .

It is an emirp because it is prime and its reverse (331652137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 731256133 - 2⁵ = 731256101 is a prime.

It is a super-2 number, since 2×731256133² = 1069471064100227378, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 731256095 and 731256104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (731256137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365628066 + 365628067.

It is an arithmetic number, because the mean of its divisors is an integer number (365628067).

Almost surely, 2^731256133 is an apocalyptic number.

It is an amenable number.

731256133 is a deficient number, since it is larger than the sum of its proper divisors (1).

731256133 is an equidigital number, since it uses as much as digits as its factorization.

731256133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 31.

The square root of 731256133 is about 27041.7479649523. The cubic root of 731256133 is about 900.9274936387.

The spelling of 731256133 in words is "seven hundred thirty-one million, two hundred fifty-six thousand, one hundred thirty-three".