731125891 has 2 divisors, whose sum is σ = 731125892. Its totient is φ = 731125890.

The previous prime is 731125859. The next prime is 731125897. The reversal of 731125891 is 198521137.

It is a strong prime.

It is an emirp because it is prime and its reverse (198521137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 731125891 - 2⁵ = 731125859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 731125891.

It is not a weakly prime, because it can be changed into another prime (731125897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365562945 + 365562946.

It is an arithmetic number, because the mean of its divisors is an integer number (365562946).

Almost surely, 2^731125891 is an apocalyptic number.

731125891 is a deficient number, since it is larger than the sum of its proper divisors (1).

731125891 is an equidigital number, since it uses as much as digits as its factorization.

731125891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 37.

The square root of 731125891 is about 27039.3396923815. The cubic root of 731125891 is about 900.8740032312.

It can be divided in two parts, 73112 and 5891, that added together give a triangular number (79003 = T₃₉₇).

The spelling of 731125891 in words is "seven hundred thirty-one million, one hundred twenty-five thousand, eight hundred ninety-one".