25550381 has 2 divisors, whose sum is σ = 25550382. Its totient is φ = 25550380.

The previous prime is 25550377. The next prime is 25550407. The reversal of 25550381 is 18305552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 6584356 = 4355^2 + 2566^2 .

It is a cyclic number.

It is not a de Polignac number, because 25550381 - 2² = 25550377 is a prime.

It is a super-2 number, since 2×25550381² = 1305643938490322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25550311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12775190 + 12775191.

It is an arithmetic number, because the mean of its divisors is an integer number (12775191).

Almost surely, 2^25550381 is an apocalyptic number.

It is an amenable number.

25550381 is a deficient number, since it is larger than the sum of its proper divisors (1).

25550381 is an equidigital number, since it uses as much as digits as its factorization.

25550381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 25550381 is about 5054.7384699903. The cubic root of 25550381 is about 294.5319821949.

The spelling of 25550381 in words is "twenty-five million, five hundred fifty thousand, three hundred eighty-one".