56420381 has 2 divisors, whose sum is σ = 56420382. Its totient is φ = 56420380.

The previous prime is 56420369. The next prime is 56420383. The reversal of 56420381 is 18302465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49477156 + 6943225 = 7034^2 + 2635^2 .

It is a cyclic number.

It is not a de Polignac number, because 56420381 - 2¹⁰ = 56419357 is a prime.

It is a super-2 number, since 2×56420381² = 6366518784370322, which contains 22 as substring.

Together with 56420383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56420383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28210190 + 28210191.

It is an arithmetic number, because the mean of its divisors is an integer number (28210191).

Almost surely, 2^56420381 is an apocalyptic number.

It is an amenable number.

56420381 is a deficient number, since it is larger than the sum of its proper divisors (1).

56420381 is an equidigital number, since it uses as much as digits as its factorization.

56420381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 56420381 is about 7511.3501449473. The cubic root of 56420381 is about 383.5411842332.

The spelling of 56420381 in words is "fifty-six million, four hundred twenty thousand, three hundred eighty-one".