1025251540 has 12 divisors (see below), whose sum is σ = 2153028276. Its totient is φ = 410100608.

The previous prime is 1025251517. The next prime is 1025251541. The reversal of 1025251540 is 451525201.

It can be written as a sum of positive squares in 2 ways, for example, as 689482564 + 335768976 = 26258^2 + 18324^2 .

It is a super-2 number, since 2×1025251540² = 2102281440544743200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025251541) 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, 25631269 + ... + 25631308.

It is an arithmetic number, because the mean of its divisors is an integer number (179419023).

Almost surely, 2^1025251540 is an apocalyptic number.

1025251540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1025251540 is an abundant number, since it is smaller than the sum of its proper divisors (1127776736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1025251540 is a wasteful number, since it uses less digits than its factorization.

1025251540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51262586 (or 51262584 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 1025251540 is about 32019.5493409885. The cubic root of 1025251540 is about 1008.3473085663.

Adding to 1025251540 its reverse (451525201), we get a palindrome (1476776741).

The spelling of 1025251540 in words is "one billion, twenty-five million, two hundred fifty-one thousand, five hundred forty".