1291356228 has 24 divisors (see below), whose sum is σ = 3033123520. Its totient is φ = 427600800.

The previous prime is 1291356169. The next prime is 1291356233. The reversal of 1291356228 is 8226531921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354523 + ... + 358146.

Almost surely, 2^1291356228 is an apocalyptic number.

It is an amenable number.

1291356228 is an abundant number, since it is smaller than the sum of its proper divisors (1741767292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291356228 is a wasteful number, since it uses less digits than its factorization.

1291356228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712827 (or 712825 counting only the distinct ones).

The product of its digits is 51840, while the sum is 39.

The square root of 1291356228 is about 35935.4452873483. The cubic root of 1291356228 is about 1088.9685914371.

The spelling of 1291356228 in words is "one billion, two hundred ninety-one million, three hundred fifty-six thousand, two hundred twenty-eight".