381450521 has 2 divisors, whose sum is σ = 381450522. Its totient is φ = 381450520.

The previous prime is 381450499. The next prime is 381450551. The reversal of 381450521 is 125054183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378691600 + 2758921 = 19460^2 + 1661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381450521 is a prime.

It is a Chen prime.

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

It is not a weakly prime, because it can be changed into another prime (381450551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190725260 + 190725261.

It is an arithmetic number, because the mean of its divisors is an integer number (190725261).

Almost surely, 2^381450521 is an apocalyptic number.

It is an amenable number.

381450521 is a deficient number, since it is larger than the sum of its proper divisors (1).

381450521 is an equidigital number, since it uses as much as digits as its factorization.

381450521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 381450521 is about 19530.7583314115. The cubic root of 381450521 is about 725.2360838760.

The spelling of 381450521 in words is "three hundred eighty-one million, four hundred fifty thousand, five hundred twenty-one".