155620247 has 8 divisors (see below), whose sum is σ = 156853344. Its totient is φ = 154391328.

The previous prime is 155620183. The next prime is 155620249. The reversal of 155620247 is 742026551.

155620247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155620247 - 2⁶ = 155620183 is a prime.

It is a super-2 number, since 2×155620247² = 48435322552682018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155620249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141833 + ... + 142925.

It is an arithmetic number, because the mean of its divisors is an integer number (19606668).

Almost surely, 2^155620247 is an apocalyptic number.

155620247 is a deficient number, since it is larger than the sum of its proper divisors (1233097).

155620247 is a wasteful number, since it uses less digits than its factorization.

155620247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 155620247 is about 12474.7844470355. The cubic root of 155620247 is about 537.8840919349.

Adding to 155620247 its reverse (742026551), we get a palindrome (897646798).

The spelling of 155620247 in words is "one hundred fifty-five million, six hundred twenty thousand, two hundred forty-seven".