1591455601 has 4 divisors (see below), whose sum is σ = 1595722612. Its totient is φ = 1587188592.

The previous prime is 1591455563. The next prime is 1591455617. The reversal of 1591455601 is 1065541951.

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 392634225 + 1198821376 = 19815^2 + 34624^2 .

It is a cyclic number.

It is not a de Polignac number, because 1591455601 - 2¹¹ = 1591453553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1591455641) 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, 2132946 + ... + 2133691.

It is an arithmetic number, because the mean of its divisors is an integer number (398930653).

Almost surely, 2^1591455601 is an apocalyptic number.

It is an amenable number.

1591455601 is a deficient number, since it is larger than the sum of its proper divisors (4267011).

1591455601 is an equidigital number, since it uses as much as digits as its factorization.

1591455601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4267010.

The product of its (nonzero) digits is 27000, while the sum is 37.

The square root of 1591455601 is about 39893.0520391709. The cubic root of 1591455601 is about 1167.5213802680.

The spelling of 1591455601 in words is "one billion, five hundred ninety-one million, four hundred fifty-five thousand, six hundred one".