155221245 has 48 divisors (see below), whose sum is σ = 282221760. Its totient is φ = 80926560.

The previous prime is 155221223. The next prime is 155221267. The reversal of 155221245 is 542122551.

155221245 is a `hidden beast` number, since 15 + 522 + 124 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (155221223) and next prime (155221267).

It is not a de Polignac number, because 155221245 - 2⁹ = 155220733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1184830 + ... + 1184960.

It is an arithmetic number, because the mean of its divisors is an integer number (5879620).

Almost surely, 2^155221245 is an apocalyptic number.

155221245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155221245 is a deficient number, since it is larger than the sum of its proper divisors (127000515).

155221245 is an equidigital number, since it uses as much as digits as its factorization.

155221245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343 (or 206 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 155221245 is about 12458.7818425398. The cubic root of 155221245 is about 537.4239964646.

Adding to 155221245 its reverse (542122551), we get a palindrome (697343796).

The spelling of 155221245 in words is "one hundred fifty-five million, two hundred twenty-one thousand, two hundred forty-five".