361599991 has 2 divisors, whose sum is σ = 361599992. Its totient is φ = 361599990.

The previous prime is 361599983. The next prime is 361600003. The reversal of 361599991 is 199995163.

It is a weak prime.

It is an emirp because it is prime and its reverse (199995163) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 361599991 - 2³ = 361599983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (361599971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180799995 + 180799996.

It is an arithmetic number, because the mean of its divisors is an integer number (180799996).

Almost surely, 2^361599991 is an apocalyptic number.

361599991 is a deficient number, since it is larger than the sum of its proper divisors (1).

361599991 is an equidigital number, since it uses as much as digits as its factorization.

361599991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 590490, while the sum is 52.

The square root of 361599991 is about 19015.7826817620. The cubic root of 361599991 is about 712.4309918186.

The spelling of 361599991 in words is "three hundred sixty-one million, five hundred ninety-nine thousand, nine hundred ninety-one".