615601601 has 4 divisors (see below), whose sum is σ = 642366912. Its totient is φ = 588836292.

The previous prime is 615601543. The next prime is 615601633. The reversal of 615601601 is 106106516.

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 a de Polignac number, because none of the positive numbers 2^k-615601601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (615601681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13382621 + ... + 13382666.

It is an arithmetic number, because the mean of its divisors is an integer number (160591728).

Almost surely, 2^615601601 is an apocalyptic number.

It is an amenable number.

615601601 is a deficient number, since it is larger than the sum of its proper divisors (26765311).

615601601 is a wasteful number, since it uses less digits than its factorization.

615601601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26765310.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 615601601 is about 24811.3200172824. The cubic root of 615601601 is about 850.6807008686.

The spelling of 615601601 in words is "six hundred fifteen million, six hundred one thousand, six hundred one".