1228609477 has 4 divisors (see below), whose sum is σ = 1228723020. Its totient is φ = 1228495936.

The previous prime is 1228609427. The next prime is 1228609513. The reversal of 1228609477 is 7749068221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 690323076 + 538286401 = 26274^2 + 23201^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228609477 - 2¹⁵ = 1228576709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228609427) 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, 38602 + ... + 62827.

It is an arithmetic number, because the mean of its divisors is an integer number (307180755).

Almost surely, 2^1228609477 is an apocalyptic number.

It is an amenable number.

1228609477 is a deficient number, since it is larger than the sum of its proper divisors (113543).

1228609477 is a wasteful number, since it uses less digits than its factorization.

1228609477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113542.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 1228609477 is about 35051.5260295468. The cubic root of 1228609477 is about 1071.0373603371.

The spelling of 1228609477 in words is "one billion, two hundred twenty-eight million, six hundred nine thousand, four hundred seventy-seven".