1231242961 has 8 divisors (see below), whose sum is σ = 1329368040. Its totient is φ = 1133605632.

The previous prime is 1231242953. The next prime is 1231243007. The reversal of 1231242961 is 1692421321.

It can be written as a sum of positive squares in 4 ways, for example, as 109327936 + 1121915025 = 10456^2 + 33495^2 .

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 1231242961 - 2³ = 1231242953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231240961) 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, 116680 + ... + 126793.

It is an arithmetic number, because the mean of its divisors is an integer number (166171005).

Almost surely, 2^1231242961 is an apocalyptic number.

It is an amenable number.

1231242961 is a deficient number, since it is larger than the sum of its proper divisors (98125079).

1231242961 is a wasteful number, since it uses less digits than its factorization.

1231242961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243875.

The product of its digits is 5184, while the sum is 31.

The square root of 1231242961 is about 35089.0718173052. The cubic root of 1231242961 is about 1071.8020586789.

The spelling of 1231242961 in words is "one billion, two hundred thirty-one million, two hundred forty-two thousand, nine hundred sixty-one".