1201212531 has 16 divisors (see below), whose sum is σ = 1780539520. Its totient is φ = 800373960.

The previous prime is 1201212527. The next prime is 1201212553. The reversal of 1201212531 is 1352121021.

1201212531 is a `hidden beast` number, since 12 + 0 + 121 + 2 + 531 = 666.

It is not a de Polignac number, because 1201212531 - 2² = 1201212527 is a prime.

It is a super-2 number, since 2×1201212531² = 2885823089262851922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201212581) 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, 43236 + ... + 65358.

It is an arithmetic number, because the mean of its divisors is an integer number (111283720).

Almost surely, 2^1201212531 is an apocalyptic number.

1201212531 is a deficient number, since it is larger than the sum of its proper divisors (579326989).

1201212531 is a wasteful number, since it uses less digits than its factorization.

1201212531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24143 (or 24137 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1201212531 is about 34658.5131100571. The cubic root of 1201212531 is about 1063.0163671587.

Adding to 1201212531 its reverse (1352121021), we get a palindrome (2553333552).

The spelling of 1201212531 in words is "one billion, two hundred one million, two hundred twelve thousand, five hundred thirty-one".