25621003 has 2 divisors, whose sum is σ = 25621004. Its totient is φ = 25621002.

The previous prime is 25620979. The next prime is 25621019. The reversal of 25621003 is 30012652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25621003 - 2⁵ = 25620971 is a prime.

It is not a weakly prime, because it can be changed into another prime (25621033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810501 + 12810502.

It is an arithmetic number, because the mean of its divisors is an integer number (12810502).

Almost surely, 2^25621003 is an apocalyptic number.

25621003 is a deficient number, since it is larger than the sum of its proper divisors (1).

25621003 is an equidigital number, since it uses as much as digits as its factorization.

25621003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 25621003 is about 5061.7193719131. The cubic root of 25621003 is about 294.8030975608.

Adding to 25621003 its reverse (30012652), we get a palindrome (55633655).

The spelling of 25621003 in words is "twenty-five million, six hundred twenty-one thousand, three".