155197807 has 4 divisors (see below), whose sum is σ = 158499936. Its totient is φ = 151895680.

The previous prime is 155197787. The next prime is 155197817. The reversal of 155197807 is 708791551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 708791551 = 13 ⋅54522427.

It is a cyclic number.

It is not a de Polignac number, because 155197807 - 2¹¹ = 155195759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155197817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650994 + ... + 1651087.

It is an arithmetic number, because the mean of its divisors is an integer number (39624984).

Almost surely, 2^155197807 is an apocalyptic number.

155197807 is a deficient number, since it is larger than the sum of its proper divisors (3302129).

155197807 is an equidigital number, since it uses as much as digits as its factorization.

155197807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3302128.

The product of its (nonzero) digits is 88200, while the sum is 43.

The square root of 155197807 is about 12457.8411853740. The cubic root of 155197807 is about 537.3969452327.

The spelling of 155197807 in words is "one hundred fifty-five million, one hundred ninety-seven thousand, eight hundred seven".