155790811 has 4 divisors (see below), whose sum is σ = 169953624. Its totient is φ = 141628000.

The previous prime is 155790809. The next prime is 155790821. The reversal of 155790811 is 118097551.

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

It is a cyclic number.

It is not a de Polignac number, because 155790811 - 2¹ = 155790809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155790821) 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, 7081390 + ... + 7081411.

It is an arithmetic number, because the mean of its divisors is an integer number (42488406).

Almost surely, 2^155790811 is an apocalyptic number.

155790811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155790811 is a deficient number, since it is larger than the sum of its proper divisors (14162813).

155790811 is a wasteful number, since it uses less digits than its factorization.

155790811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14162812.

The product of its (nonzero) digits is 12600, while the sum is 37.

The square root of 155790811 is about 12481.6189254439. The cubic root of 155790811 is about 538.0805320224.

The spelling of 155790811 in words is "one hundred fifty-five million, seven hundred ninety thousand, eight hundred eleven".