231947029 has 2 divisors, whose sum is σ = 231947030. Its totient is φ = 231947028.

The previous prime is 231946999. The next prime is 231947033. The reversal of 231947029 is 920749132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154330929 + 77616100 = 12423^2 + 8810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231947029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231947059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115973514 + 115973515.

It is an arithmetic number, because the mean of its divisors is an integer number (115973515).

Almost surely, 2^231947029 is an apocalyptic number.

It is an amenable number.

231947029 is a deficient number, since it is larger than the sum of its proper divisors (1).

231947029 is an equidigital number, since it uses as much as digits as its factorization.

231947029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 231947029 is about 15229.8072541973. The cubic root of 231947029 is about 614.4165961480.

The spelling of 231947029 in words is "two hundred thirty-one million, nine hundred forty-seven thousand, twenty-nine".