612319661 has 4 divisors (see below), whose sum is σ = 613774524. Its totient is φ = 610864800.

The previous prime is 612319649. The next prime is 612319663. The reversal of 612319661 is 166913216.

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 248692900 + 363626761 = 15770^2 + 19069^2 .

It is a cyclic number.

It is not a de Polignac number, because 612319661 - 2⁶ = 612319597 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 (612319663) 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, 726800 + ... + 727641.

It is an arithmetic number, because the mean of its divisors is an integer number (153443631).

Almost surely, 2^612319661 is an apocalyptic number.

It is an amenable number.

612319661 is a deficient number, since it is larger than the sum of its proper divisors (1454863).

612319661 is a wasteful number, since it uses less digits than its factorization.

612319661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454862.

The product of its digits is 11664, while the sum is 35.

The square root of 612319661 is about 24745.0936753127. The cubic root of 612319661 is about 849.1662694614.

The spelling of 612319661 in words is "six hundred twelve million, three hundred nineteen thousand, six hundred sixty-one".