155121132 has 12 divisors (see below), whose sum is σ = 361949336. Its totient is φ = 51707040.

The previous prime is 155121121. The next prime is 155121133. The reversal of 155121132 is 231121551.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×155121132² = 48125131185922848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155121099 and 155121108.

It is not an unprimeable number, because it can be changed into a prime (155121133) 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, 6463369 + ... + 6463392.

Almost surely, 2^155121132 is an apocalyptic number.

155121132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155121132 is an abundant number, since it is smaller than the sum of its proper divisors (206828204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155121132 is a wasteful number, since it uses less digits than its factorization.

155121132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12926768 (or 12926766 counting only the distinct ones).

The product of its digits is 300, while the sum is 21.

The square root of 155121132 is about 12454.7634260953. The cubic root of 155121132 is about 537.3084308841.

Adding to 155121132 its reverse (231121551), we get a palindrome (386242683).

The spelling of 155121132 in words is "one hundred fifty-five million, one hundred twenty-one thousand, one hundred thirty-two".