1231021051 has 8 divisors (see below), whose sum is σ = 1403698464. Its totient is φ = 1069484160.

The previous prime is 1231021049. The next prime is 1231021061. The reversal of 1231021051 is 1501201321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231021051 - 2¹ = 1231021049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231021021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2784895 + ... + 2785336.

It is an arithmetic number, because the mean of its divisors is an integer number (175462308).

Almost surely, 2^1231021051 is an apocalyptic number.

1231021051 is a deficient number, since it is larger than the sum of its proper divisors (172677413).

1231021051 is a wasteful number, since it uses less digits than its factorization.

1231021051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5570261.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1231021051 is about 35085.9095792029. The cubic root of 1231021051 is about 1071.7376636209.

Adding to 1231021051 its reverse (1501201321), we get a palindrome (2732222372).

The spelling of 1231021051 in words is "one billion, two hundred thirty-one million, twenty-one thousand, fifty-one".