25431019 has 4 divisors (see below), whose sum is σ = 25494840. Its totient is φ = 25367200.

The previous prime is 25431013. The next prime is 25431053. The reversal of 25431019 is 91013452.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25431019 - 2¹¹ = 25428971 is a prime.

It is a super-2 number, since 2×25431019² = 1293473454756722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25430984 and 25431002.

It is not an unprimeable number, because it can be changed into a prime (25431013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31309 + ... + 32110.

It is an arithmetic number, because the mean of its divisors is an integer number (6373710).

Almost surely, 2^25431019 is an apocalyptic number.

25431019 is a deficient number, since it is larger than the sum of its proper divisors (63821).

25431019 is an equidigital number, since it uses as much as digits as its factorization.

25431019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63820.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 25431019 is about 5042.9177070422. The cubic root of 25431019 is about 294.0726176922.

The spelling of 25431019 in words is "twenty-five million, four hundred thirty-one thousand, nineteen".