321072541 has 2 divisors, whose sum is σ = 321072542. Its totient is φ = 321072540.

The previous prime is 321072539. The next prime is 321072547. The reversal of 321072541 is 145270123.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320947225 + 125316 = 17915^2 + 354^2 .

It is a cyclic number.

It is not a de Polignac number, because 321072541 - 2¹ = 321072539 is a prime.

Together with 321072539, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321072547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160536270 + 160536271.

It is an arithmetic number, because the mean of its divisors is an integer number (160536271).

Almost surely, 2^321072541 is an apocalyptic number.

It is an amenable number.

321072541 is a deficient number, since it is larger than the sum of its proper divisors (1).

321072541 is an equidigital number, since it uses as much as digits as its factorization.

321072541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 321072541 is about 17918.4971747075. The cubic root of 321072541 is about 684.7537012111.

The spelling of 321072541 in words is "three hundred twenty-one million, seventy-two thousand, five hundred forty-one".