1025515 has 4 divisors (see below), whose sum is σ = 1230624. Its totient is φ = 820408.

The previous prime is 1025513. The next prime is 1025537. The reversal of 1025515 is 5155201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5155201 = 163 ⋅31627.

It is a cyclic number.

It is not a de Polignac number, because 1025515 - 2¹ = 1025513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1025492 and 1025501.

It is not an unprimeable number, because it can be changed into a prime (1025513) 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, 102547 + ... + 102556.

It is an arithmetic number, because the mean of its divisors is an integer number (307656).

2^1025515 is an apocalyptic number.

1025515 is a deficient number, since it is larger than the sum of its proper divisors (205109).

1025515 is an equidigital number, since it uses as much as digits as its factorization.

1025515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205108.

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 1025515 is about 1012.6771449974. The cubic root of 1025515 is about 100.8433673203.

It can be divided in two parts, 1025 and 515, that added together give a triangular number (1540 = T₅₅).

The spelling of 1025515 in words is "one million, twenty-five thousand, five hundred fifteen".