1125721310 has 32 divisors (see below), whose sum is σ = 2437655040. Its totient is φ = 365647392.

The previous prime is 1125721307. The next prime is 1125721313. The reversal of 1125721310 is 131275211.

It is an interprime number because it is at equal distance from previous prime (1125721307) and next prime (1125721313).

It is a super-2 number, since 2×1125721310² = 2534496935576232200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125721313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421874 + ... + 424533.

It is an arithmetic number, because the mean of its divisors is an integer number (76176720).

Almost surely, 2^1125721310 is an apocalyptic number.

1125721310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1125721310 is an abundant number, since it is smaller than the sum of its proper divisors (1311933730).

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

1125721310 is a wasteful number, since it uses less digits than its factorization.

1125721310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846440.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 1125721310 is about 33551.7705941132. The cubic root of 1125721310 is about 1040.2641433351.

Adding to 1125721310 its reverse (131275211), we get a palindrome (1256996521).

The spelling of 1125721310 in words is "one billion, one hundred twenty-five million, seven hundred twenty-one thousand, three hundred ten".