1231961228 has 12 divisors (see below), whose sum is σ = 2156297640. Its totient is φ = 615876192.

The previous prime is 1231961201. The next prime is 1231961231. The reversal of 1231961228 is 8221691321.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4400 + ... + 49832.

It is an arithmetic number, because the mean of its divisors is an integer number (179691470).

Almost surely, 2^1231961228 is an apocalyptic number.

It is an amenable number.

1231961228 is a deficient number, since it is larger than the sum of its proper divisors (924336412).

1231961228 is a wasteful number, since it uses less digits than its factorization.

1231961228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52216 (or 52214 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 1231961228 is about 35099.3052352892. The cubic root of 1231961228 is about 1072.0104362892.

The spelling of 1231961228 in words is "one billion, two hundred thirty-one million, nine hundred sixty-one thousand, two hundred twenty-eight".