1525640245 has 16 divisors (see below), whose sum is σ = 1963491840. Its totient is φ = 1134454464.

The previous prime is 1525640239. The next prime is 1525640273. The reversal of 1525640245 is 5420465251.

It is a cyclic number.

It is not a de Polignac number, because 1525640245 - 2²¹ = 1523543093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1525640245.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146469 + ... + 156538.

It is an arithmetic number, because the mean of its divisors is an integer number (122718240).

Almost surely, 2^1525640245 is an apocalyptic number.

It is an amenable number.

1525640245 is a deficient number, since it is larger than the sum of its proper divisors (437851595).

1525640245 is a wasteful number, since it uses less digits than its factorization.

1525640245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303084.

The product of its (nonzero) digits is 48000, while the sum is 34.

The square root of 1525640245 is about 39059.4450165386. The cubic root of 1525640245 is about 1151.1998177144.

The spelling of 1525640245 in words is "one billion, five hundred twenty-five million, six hundred forty thousand, two hundred forty-five".