1213044657 has 8 divisors (see below), whose sum is σ = 1764428640. Its totient is φ = 735178560.

The previous prime is 1213044641. The next prime is 1213044659. The reversal of 1213044657 is 7564403121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213044657 - 2⁴ = 1213044641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 36758929 = 1213044657 / (1 + 2 + 1 + 3 + 0 + 4 + 4 + 6 + 5 + 7).

It is not an unprimeable number, because it can be changed into a prime (1213044659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18379432 + ... + 18379497.

It is an arithmetic number, because the mean of its divisors is an integer number (220553580).

Almost surely, 2^1213044657 is an apocalyptic number.

It is an amenable number.

1213044657 is a deficient number, since it is larger than the sum of its proper divisors (551383983).

1213044657 is a wasteful number, since it uses less digits than its factorization.

1213044657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36758943.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 1213044657 is about 34828.7906336123. The cubic root of 1213044657 is about 1066.4952604242.

Adding to 1213044657 its reverse (7564403121), we get a palindrome (8777447778).

The spelling of 1213044657 in words is "one billion, two hundred thirteen million, forty-four thousand, six hundred fifty-seven".