1251340425 has 18 divisors (see below), whose sum is σ = 2241290142. Its totient is φ = 667381440.

The previous prime is 1251340421. The next prime is 1251340429. The reversal of 1251340425 is 5240431521.

1251340425 is a `hidden beast` number, since 1 + 251 + 3 + 404 + 2 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1251340421) and next prime (1251340429).

It can be written as a sum of positive squares in 3 ways, for example, as 116122176 + 1135218249 = 10776^2 + 33693^2 .

It is not a de Polignac number, because 1251340425 - 2² = 1251340421 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1251340421) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2780532 + ... + 2780981.

It is an arithmetic number, because the mean of its divisors is an integer number (124516119).

Almost surely, 2^1251340425 is an apocalyptic number.

1251340425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1251340425 is a deficient number, since it is larger than the sum of its proper divisors (989949717).

1251340425 is a wasteful number, since it uses less digits than its factorization.

1251340425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5561529 (or 5561521 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 1251340425 is about 35374.2904522479. The cubic root of 1251340425 is about 1077.6022552131.

Adding to 1251340425 its reverse (5240431521), we get a palindrome (6491771946).

The spelling of 1251340425 in words is "one billion, two hundred fifty-one million, three hundred forty thousand, four hundred twenty-five".