1228926531 has 16 divisors (see below), whose sum is σ = 1912495104. Its totient is φ = 687301824.

The previous prime is 1228926527. The next prime is 1228926563. The reversal of 1228926531 is 1356298221.

It is not a de Polignac number, because 1228926531 - 2² = 1228926527 is a prime.

It is a super-2 number, since 2×1228926531² = 3020520837191387922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1228926531.

It is not an unprimeable number, because it can be changed into a prime (1228926511) 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, 621570 + ... + 623543.

It is an arithmetic number, because the mean of its divisors is an integer number (119530944).

Almost surely, 2^1228926531 is an apocalyptic number.

1228926531 is a deficient number, since it is larger than the sum of its proper divisors (683568573).

1228926531 is a wasteful number, since it uses less digits than its factorization.

1228926531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245170.

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

The square root of 1228926531 is about 35056.0484224905. The cubic root of 1228926531 is about 1071.1294827675.

The spelling of 1228926531 in words is "one billion, two hundred twenty-eight million, nine hundred twenty-six thousand, five hundred thirty-one".