612401209 has 4 divisors (see below), whose sum is σ = 699887104. Its totient is φ = 524915316.

The previous prime is 612401203. The next prime is 612401219. The reversal of 612401209 is 902104216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 612401209 - 2³ = 612401201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (612401201) 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, 43742937 + ... + 43742950.

It is an arithmetic number, because the mean of its divisors is an integer number (174971776).

Almost surely, 2^612401209 is an apocalyptic number.

It is an amenable number.

612401209 is a deficient number, since it is larger than the sum of its proper divisors (87485895).

612401209 is an equidigital number, since it uses as much as digits as its factorization.

612401209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87485894.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 612401209 is about 24746.7413814425. The cubic root of 612401209 is about 849.2039647708.

The spelling of 612401209 in words is "six hundred twelve million, four hundred one thousand, two hundred nine".