381106421 has 2 divisors, whose sum is σ = 381106422. Its totient is φ = 381106420.

The previous prime is 381106417. The next prime is 381106471. The reversal of 381106421 is 124601183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228312100 + 152794321 = 15110^2 + 12361^2 .

It is a cyclic number.

It is not a de Polignac number, because 381106421 - 2² = 381106417 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381106471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190553210 + 190553211.

It is an arithmetic number, because the mean of its divisors is an integer number (190553211).

Almost surely, 2^381106421 is an apocalyptic number.

It is an amenable number.

381106421 is a deficient number, since it is larger than the sum of its proper divisors (1).

381106421 is an equidigital number, since it uses as much as digits as its factorization.

381106421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 381106421 is about 19521.9471621045. The cubic root of 381106421 is about 725.0179439078.

The spelling of 381106421 in words is "three hundred eighty-one million, one hundred six thousand, four hundred twenty-one".