616703521 has 4 divisors (see below), whose sum is σ = 704804032. Its totient is φ = 528603012.

The previous prime is 616703471. The next prime is 616703533. The reversal of 616703521 is 125307616.

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 not a de Polignac number, because 616703521 - 2¹⁵ = 616670753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616703561) 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, 44050245 + ... + 44050258.

It is an arithmetic number, because the mean of its divisors is an integer number (176201008).

Almost surely, 2^616703521 is an apocalyptic number.

It is an amenable number.

616703521 is a deficient number, since it is larger than the sum of its proper divisors (88100511).

616703521 is an equidigital number, since it uses as much as digits as its factorization.

616703521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88100510.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 616703521 is about 24833.5160821016. The cubic root of 616703521 is about 851.1879679771.

The spelling of 616703521 in words is "six hundred sixteen million, seven hundred three thousand, five hundred twenty-one".