1226153987 has 4 divisors (see below), whose sum is σ = 1254669240. Its totient is φ = 1197638736.

The previous prime is 1226153983. The next prime is 1226154029. The reversal of 1226153987 is 7893516221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7893516221 = 4517 ⋅1747513.

It is a cyclic number.

It is not a de Polignac number, because 1226153987 - 2² = 1226153983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226153983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14257562 + ... + 14257647.

It is an arithmetic number, because the mean of its divisors is an integer number (313667310).

Almost surely, 2^1226153987 is an apocalyptic number.

1226153987 is a deficient number, since it is larger than the sum of its proper divisors (28515253).

1226153987 is an equidigital number, since it uses as much as digits as its factorization.

1226153987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28515252.

The product of its digits is 181440, while the sum is 44.

The square root of 1226153987 is about 35016.4816479326. The cubic root of 1226153987 is about 1070.3233619586.

The spelling of 1226153987 in words is "one billion, two hundred twenty-six million, one hundred fifty-three thousand, nine hundred eighty-seven".