1234994357809 has 9 divisors (see below), whose sum is σ = 1247456464939. Its totient is φ = 1222655560600.

The previous prime is 1234994357797. The next prime is 1234994358053. The reversal of 1234994357809 is 9087534994321.

The square root of 1234994357809 is 1111303.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1186567954209 + 48426403600 = 1089297^2 + 220060^2 .

It is not a de Polignac number, because 1234994357809 - 2¹⁵ = 1234994325041 is a prime.

It is a super-2 number, since 2×1234994357809² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1234994357609) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 112236102 + ... + 112247104.

Almost surely, 2^{1234994357809} is an apocalyptic number.

1234994357809 is the 1111303-rd square number.

1234994357809 is the 555652-nd centered octagonal number.

It is an amenable number.

1234994357809 is a deficient number, since it is larger than the sum of its proper divisors (12462107130).

1234994357809 is an frugal number, since it uses more digits than its factorization.

1234994357809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22208 (or 11104 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 64.

Multiplying 1234994357809 by its sum of digits (64), we get a square (79039638899776 = 8890424²).

The spelling of 1234994357809 in words is "one trillion, two hundred thirty-four billion, nine hundred ninety-four million, three hundred fifty-seven thousand, eight hundred nine".