1245100000 has 72 divisors (see below), whose sum is σ = 3064163256. Its totient is φ = 498000000.

The previous prime is 1245099991. The next prime is 1245100033. The reversal of 1245100000 is 15421.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93775 + ... + 106225.

It is an arithmetic number, because the mean of its divisors is an integer number (42557823).

Almost surely, 2^1245100000 is an apocalyptic number.

1245100000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1245100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1532081628).

1245100000 is an abundant number, since it is smaller than the sum of its proper divisors (1819063256).

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

1245100000 is an frugal number, since it uses more digits than its factorization.

1245100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12486 (or 12458 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 1245100000 is about 35285.9745508042. The cubic root of 1245100000 is about 1075.8079377856.

Adding to 1245100000 its reverse (15421), we get a palindrome (1245115421).

The spelling of 1245100000 in words is "one billion, two hundred forty-five million, one hundred thousand".