155056507 has 4 divisors (see below), whose sum is σ = 164177496. Its totient is φ = 145935520.

The previous prime is 155056493. The next prime is 155056519. The reversal of 155056507 is 705650551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 705650551 = 31 ⋅22762921.

It is a cyclic number.

It is not a de Polignac number, because 155056507 - 2⁷ = 155056379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155056597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4560469 + ... + 4560502.

It is an arithmetic number, because the mean of its divisors is an integer number (41044374).

Almost surely, 2^155056507 is an apocalyptic number.

155056507 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

155056507 is a deficient number, since it is larger than the sum of its proper divisors (9120989).

155056507 is an equidigital number, since it uses as much as digits as its factorization.

155056507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9120988.

The product of its (nonzero) digits is 26250, while the sum is 34.

The square root of 155056507 is about 12452.1687669257. The cubic root of 155056507 is about 537.2338045151.

The spelling of 155056507 in words is "one hundred fifty-five million, fifty-six thousand, five hundred seven".