1251001525 has 18 divisors (see below), whose sum is σ = 1647868550. Its totient is φ = 941925120.

The previous prime is 1251001519. The next prime is 1251001601. The reversal of 1251001525 is 5251001521.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 79103236 + 1171898289 = 8894^2 + 34233^2 .

It is not a de Polignac number, because 1251001525 - 2¹³ = 1250993333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1251001496 and 1251001505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 79350 + ... + 93799.

Almost surely, 2^1251001525 is an apocalyptic number.

It is an amenable number.

1251001525 is a deficient number, since it is larger than the sum of its proper divisors (396867025).

1251001525 is a wasteful number, since it uses less digits than its factorization.

1251001525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173193 (or 173171 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 22.

The square root of 1251001525 is about 35369.4999257835. The cubic root of 1251001525 is about 1077.5049642412.

The spelling of 1251001525 in words is "one billion, two hundred fifty-one million, one thousand, five hundred twenty-five".