157106509 has 4 divisors (see below), whose sum is σ = 179550304. Its totient is φ = 134662716.

The previous prime is 157106507. The next prime is 157106513. The reversal of 157106509 is 905601751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 157106509 - 2¹ = 157106507 is a prime.

It is a super-3 number, since 3×157106509³ (a number of 26 digits) contains 333 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 (157106501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11221887 + ... + 11221900.

It is an arithmetic number, because the mean of its divisors is an integer number (44887576).

Almost surely, 2^157106509 is an apocalyptic number.

It is an amenable number.

157106509 is a deficient number, since it is larger than the sum of its proper divisors (22443795).

157106509 is an equidigital number, since it uses as much as digits as its factorization.

157106509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22443794.

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 157106509 is about 12534.2135373545. The cubic root of 157106509 is about 539.5910358032.

The spelling of 157106509 in words is "one hundred fifty-seven million, one hundred six thousand, five hundred nine".