155521412 has 6 divisors (see below), whose sum is σ = 272162478. Its totient is φ = 77760704.

The previous prime is 155521409. The next prime is 155521427. The reversal of 155521412 is 214125551.

It can be written as a sum of positive squares in only one way, i.e., 152374336 + 3147076 = 12344^2 + 1774^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19440173 + ... + 19440180.

It is an arithmetic number, because the mean of its divisors is an integer number (45360413).

Almost surely, 2^155521412 is an apocalyptic number.

It is an amenable number.

155521412 is a deficient number, since it is larger than the sum of its proper divisors (116641066).

155521412 is a wasteful number, since it uses less digits than its factorization.

155521412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38880357 (or 38880355 counting only the distinct ones).

The product of its digits is 2000, while the sum is 26.

The square root of 155521412 is about 12470.8224267688. The cubic root of 155521412 is about 537.7701970880.

Adding to 155521412 its reverse (214125551), we get a palindrome (369646963).

The spelling of 155521412 in words is "one hundred fifty-five million, five hundred twenty-one thousand, four hundred twelve".