609756421 has 4 divisors (see below), whose sum is σ = 609852492. Its totient is φ = 609660352.

The previous prime is 609756419. The next prime is 609756437. The reversal of 609756421 is 124657906.

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 170015521 + 439740900 = 13039^2 + 20970^2 .

It is a cyclic number.

It is not a de Polignac number, because 609756421 - 2¹ = 609756419 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 (609756461) 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, 37786 + ... + 51451.

It is an arithmetic number, because the mean of its divisors is an integer number (152463123).

Almost surely, 2^609756421 is an apocalyptic number.

It is an amenable number.

609756421 is a deficient number, since it is larger than the sum of its proper divisors (96071).

609756421 is an equidigital number, since it uses as much as digits as its factorization.

609756421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96070.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 609756421 is about 24693.2464653800. The cubic root of 609756421 is about 847.9797099134.

The spelling of 609756421 in words is "six hundred nine million, seven hundred fifty-six thousand, four hundred twenty-one".