616231553 has 4 divisors (see below), whose sum is σ = 704264640. Its totient is φ = 528198468.

The previous prime is 616231519. The next prime is 616231597. The reversal of 616231553 is 355132616.

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 616231553 - 2⁶ = 616231489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (616231853) 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, 44016533 + ... + 44016546.

It is an arithmetic number, because the mean of its divisors is an integer number (176066160).

Almost surely, 2^616231553 is an apocalyptic number.

It is an amenable number.

616231553 is a deficient number, since it is larger than the sum of its proper divisors (88033087).

616231553 is an equidigital number, since it uses as much as digits as its factorization.

616231553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88033086.

The product of its digits is 16200, while the sum is 32.

The square root of 616231553 is about 24824.0116218149. The cubic root of 616231553 is about 850.9707723036.

The spelling of 616231553 in words is "six hundred sixteen million, two hundred thirty-one thousand, five hundred fifty-three".