155651225 has 6 divisors (see below), whose sum is σ = 193007550. Its totient is φ = 124520960.

The previous prime is 155651203. The next prime is 155651261. The reversal of 155651225 is 522156551.

It can be written as a sum of positive squares in 3 ways, for example, as 54125449 + 101525776 = 7357^2 + 10076^2 .

It is not a de Polignac number, because 155651225 - 2⁶ = 155651161 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 155651191 and 155651200.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3113000 + ... + 3113049.

It is an arithmetic number, because the mean of its divisors is an integer number (32167925).

Almost surely, 2^155651225 is an apocalyptic number.

It is an amenable number.

155651225 is a deficient number, since it is larger than the sum of its proper divisors (37356325).

155651225 is an equidigital number, since it uses as much as digits as its factorization.

155651225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6226059 (or 6226054 counting only the distinct ones).

The product of its digits is 15000, while the sum is 32.

The square root of 155651225 is about 12476.0260099120. The cubic root of 155651225 is about 537.9197802385.

The spelling of 155651225 in words is "one hundred fifty-five million, six hundred fifty-one thousand, two hundred twenty-five".