1211531432 has 8 divisors (see below), whose sum is σ = 2271621450. Its totient is φ = 605765712.

The previous prime is 1211531413. The next prime is 1211531459. The reversal of 1211531432 is 2341351121.

It can be written as a sum of positive squares in only one way, i.e., 980065636 + 231465796 = 31306^2 + 15214^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1211531398 and 1211531407.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75720707 + ... + 75720722.

Almost surely, 2^1211531432 is an apocalyptic number.

It is an amenable number.

1211531432 is a deficient number, since it is larger than the sum of its proper divisors (1060090018).

1211531432 is a wasteful number, since it uses less digits than its factorization.

1211531432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151441435 (or 151441431 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 1211531432 is about 34807.0600884361. The cubic root of 1211531432 is about 1066.0516057418.

Adding to 1211531432 its reverse (2341351121), we get a palindrome (3552882553).

The spelling of 1211531432 in words is "one billion, two hundred eleven million, five hundred thirty-one thousand, four hundred thirty-two".