156949505 has 4 divisors (see below), whose sum is σ = 188339412. Its totient is φ = 125559600.

The previous prime is 156949451. The next prime is 156949561. The reversal of 156949505 is 505949651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505949651 = 19 ⋅26628929.

It can be written as a sum of positive squares in 2 ways, for example, as 92179201 + 64770304 = 9601^2 + 8048^2 .

It is not a de Polignac number, because 156949505 - 2¹² = 156945409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15694946 + ... + 15694955.

It is an arithmetic number, because the mean of its divisors is an integer number (47084853).

Almost surely, 2^156949505 is an apocalyptic number.

It is an amenable number.

156949505 is a deficient number, since it is larger than the sum of its proper divisors (31389907).

156949505 is an equidigital number, since it uses as much as digits as its factorization.

156949505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31389906.

The product of its (nonzero) digits is 243000, while the sum is 44.

The square root of 156949505 is about 12527.9489542383. The cubic root of 156949505 is about 539.4112295726.

The spelling of 156949505 in words is "one hundred fifty-six million, nine hundred forty-nine thousand, five hundred five".