1209241745 has 4 divisors (see below), whose sum is σ = 1451090100. Its totient is φ = 967393392.

The previous prime is 1209241723. The next prime is 1209241763. The reversal of 1209241745 is 5471429021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5471429021 = 2357 ⋅2321353.

It can be written as a sum of positive squares in 2 ways, for example, as 212955649 + 996286096 = 14593^2 + 31564^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209241745 - 2¹⁶ = 1209176209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120924170 + ... + 120924179.

It is an arithmetic number, because the mean of its divisors is an integer number (362772525).

Almost surely, 2^1209241745 is an apocalyptic number.

It is an amenable number.

1209241745 is a deficient number, since it is larger than the sum of its proper divisors (241848355).

1209241745 is an equidigital number, since it uses as much as digits as its factorization.

1209241745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241848354.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 1209241745 is about 34774.1534045043. The cubic root of 1209241745 is about 1065.3796012123.

The spelling of 1209241745 in words is "one billion, two hundred nine million, two hundred forty-one thousand, seven hundred forty-five".