6990155 has 4 divisors (see below), whose sum is σ = 8388192. Its totient is φ = 5592120.

The previous prime is 6990107. The next prime is 6990161. The reversal of 6990155 is 5510996.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6990155 - 2¹⁸ = 6728011 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699011 + ... + 699020.

It is an arithmetic number, because the mean of its divisors is an integer number (2097048).

Almost surely, 2^6990155 is an apocalyptic number.

6990155 is a deficient number, since it is larger than the sum of its proper divisors (1398037).

6990155 is a wasteful number, since it uses less digits than its factorization.

6990155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398036.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 6990155 is about 2643.8901263101. The cubic root of 6990155 is about 191.2033961658.

The spelling of 6990155 in words is "six million, nine hundred ninety thousand, one hundred fifty-five".