231429997 has 2 divisors, whose sum is σ = 231429998. Its totient is φ = 231429996.

The previous prime is 231429949. The next prime is 231430007. The reversal of 231429997 is 799924132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190136521 + 41293476 = 13789^2 + 6426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231429997 is a prime.

It is a super-2 number, since 2×231429997² = 107119687022840018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231429917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115714998 + 115714999.

It is an arithmetic number, because the mean of its divisors is an integer number (115714999).

Almost surely, 2^231429997 is an apocalyptic number.

It is an amenable number.

231429997 is a deficient number, since it is larger than the sum of its proper divisors (1).

231429997 is an equidigital number, since it uses as much as digits as its factorization.

231429997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 231429997 is about 15212.8234394540. The cubic root of 231429997 is about 613.9597254898.

The spelling of 231429997 in words is "two hundred thirty-one million, four hundred twenty-nine thousand, nine hundred ninety-seven".