1231520706 has 32 divisors (see below), whose sum is σ = 2947230720. Its totient is φ = 378929232.

The previous prime is 1231520687. The next prime is 1231520729. The reversal of 1231520706 is 6070251321.

It is a happy number.

It is a super-3 number, since 3×1231520706³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1231520706.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 876450 + ... + 877853.

It is an arithmetic number, because the mean of its divisors is an integer number (92100960).

Almost surely, 2^1231520706 is an apocalyptic number.

1231520706 is an abundant number, since it is smaller than the sum of its proper divisors (1715710014).

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

1231520706 is a wasteful number, since it uses less digits than its factorization.

1231520706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754327 (or 1754321 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 1231520706 is about 35093.0293078269. The cubic root of 1231520706 is about 1071.8826453410.

The spelling of 1231520706 in words is "one billion, two hundred thirty-one million, five hundred twenty thousand, seven hundred six".