1025155100 has 18 divisors (see below), whose sum is σ = 2224586784. Its totient is φ = 410062000.

The previous prime is 1025155069. The next prime is 1025155129. The reversal of 1025155100 is 15515201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

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 5 ways as a sum of consecutive naturals, for example, 5125676 + ... + 5125875.

Almost surely, 2^1025155100 is an apocalyptic number.

1025155100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1025155100 is an abundant number, since it is smaller than the sum of its proper divisors (1199431684).

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

1025155100 is a wasteful number, since it uses less digits than its factorization.

1025155100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10251565 (or 10251558 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 1025155100 is about 32018.0433505859. The cubic root of 1025155100 is about 1008.3156909389.

The spelling of 1025155100 in words is "one billion, twenty-five million, one hundred fifty-five thousand, one hundred".