515050091 has 4 divisors (see below), whose sum is σ = 515811552. Its totient is φ = 514288632.

The previous prime is 515050079. The next prime is 515050093. The reversal of 515050091 is 190050515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190050515 = 5 ⋅38010103.

It is a cyclic number.

It is not a de Polignac number, because 515050091 - 2¹⁸ = 514787947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 515050091.

It is not an unprimeable number, because it can be changed into a prime (515050093) 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, 379715 + ... + 381068.

It is an arithmetic number, because the mean of its divisors is an integer number (128952888).

Almost surely, 2^515050091 is an apocalyptic number.

515050091 is a deficient number, since it is larger than the sum of its proper divisors (761461).

515050091 is an equidigital number, since it uses as much as digits as its factorization.

515050091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761460.

The product of its (nonzero) digits is 1125, while the sum is 26.

The square root of 515050091 is about 22694.7150455783. The cubic root of 515050091 is about 801.5854449423.

The spelling of 515050091 in words is "five hundred fifteen million, fifty thousand, ninety-one".