155012207 has 4 divisors (see below), whose sum is σ = 177156816. Its totient is φ = 132867600.

The previous prime is 155012177. The next prime is 155012213. The reversal of 155012207 is 702210551.

It is a happy number.

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 155012207 - 2⁸ = 155011951 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 (155012257) 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, 11072294 + ... + 11072307.

It is an arithmetic number, because the mean of its divisors is an integer number (44289204).

Almost surely, 2^155012207 is an apocalyptic number.

155012207 is a deficient number, since it is larger than the sum of its proper divisors (22144609).

155012207 is an equidigital number, since it uses as much as digits as its factorization.

155012207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22144608.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 155012207 is about 12450.3898332542. The cubic root of 155012207 is about 537.1826366648.

Adding to 155012207 its reverse (702210551), we get a palindrome (857222758).

The spelling of 155012207 in words is "one hundred fifty-five million, twelve thousand, two hundred seven".