232740821 has 2 divisors, whose sum is σ = 232740822. Its totient is φ = 232740820.

The previous prime is 232740799. The next prime is 232740847. The reversal of 232740821 is 128047232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151560721 + 81180100 = 12311^2 + 9010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-232740821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (232742821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116370410 + 116370411.

It is an arithmetic number, because the mean of its divisors is an integer number (116370411).

Almost surely, 2^232740821 is an apocalyptic number.

It is an amenable number.

232740821 is a deficient number, since it is larger than the sum of its proper divisors (1).

232740821 is an equidigital number, since it uses as much as digits as its factorization.

232740821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 232740821 is about 15255.8454698519. The cubic root of 232740821 is about 615.1167037874.

The spelling of 232740821 in words is "two hundred thirty-two million, seven hundred forty thousand, eight hundred twenty-one".