731223137 has 2 divisors, whose sum is σ = 731223138. Its totient is φ = 731223136.

The previous prime is 731223089. The next prime is 731223149. The reversal of 731223137 is 731322137.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617075281 + 114147856 = 24841^2 + 10684^2 .

It is a cyclic number.

It is not a de Polignac number, because 731223137 - 2²⁶ = 664114273 is a prime.

It is not a weakly prime, because it can be changed into another prime (731223187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365611568 + 365611569.

It is an arithmetic number, because the mean of its divisors is an integer number (365611569).

Almost surely, 2^731223137 is an apocalyptic number.

It is an amenable number.

731223137 is a deficient number, since it is larger than the sum of its proper divisors (1).

731223137 is an equidigital number, since it uses as much as digits as its factorization.

731223137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 29.

The square root of 731223137 is about 27041.1378643725. The cubic root of 731223137 is about 900.9139427777.

The spelling of 731223137 in words is "seven hundred thirty-one million, two hundred twenty-three thousand, one hundred thirty-seven".