1601323987 has 2 divisors, whose sum is σ = 1601323988. Its totient is φ = 1601323986.

The previous prime is 1601323979. The next prime is 1601324041. The reversal of 1601323987 is 7893231061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1601323987 - 2³ = 1601323979 is a prime.

It is a super-2 number, since 2×1601323987² = 5128477022683152338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1601323937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800661993 + 800661994.

It is an arithmetic number, because the mean of its divisors is an integer number (800661994).

Almost surely, 2^1601323987 is an apocalyptic number.

1601323987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601323987 is an equidigital number, since it uses as much as digits as its factorization.

1601323987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 1601323987 is about 40016.5464152018. The cubic root of 1601323987 is about 1169.9296197955.

It can be divided in two parts, 16013 and 23987, that added together give a square (40000 = 200²).

The spelling of 1601323987 in words is "one billion, six hundred one million, three hundred twenty-three thousand, nine hundred eighty-seven".