155197805 has 16 divisors (see below), whose sum is σ = 213767424. Its totient is φ = 105959040.

The previous prime is 155197787. The next prime is 155197817. The reversal of 155197805 is 508791551.

It is not a de Polignac number, because 155197805 - 2⁶ = 155197741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1361 + ... + 17670.

It is an arithmetic number, because the mean of its divisors is an integer number (13360464).

Almost surely, 2^155197805 is an apocalyptic number.

It is an amenable number.

155197805 is a deficient number, since it is larger than the sum of its proper divisors (58569619).

155197805 is a wasteful number, since it uses less digits than its factorization.

155197805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19276.

The product of its (nonzero) digits is 63000, while the sum is 41.

The square root of 155197805 is about 12457.8411051032. The cubic root of 155197805 is about 537.3969429242.

The spelling of 155197805 in words is "one hundred fifty-five million, one hundred ninety-seven thousand, eight hundred five".