150731561 has 4 divisors (see below), whose sum is σ = 150780372. Its totient is φ = 150682752.

The previous prime is 150731527. The next prime is 150731573. The reversal of 150731561 is 165137051.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165137051 = 12163 ⋅13577.

It can be written as a sum of positive squares in 2 ways, for example, as 86025625 + 64705936 = 9275^2 + 8044^2 .

It is a cyclic number.

It is not a de Polignac number, because 150731561 - 2¹⁴ = 150715177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (150731591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19436 + ... + 26061.

It is an arithmetic number, because the mean of its divisors is an integer number (37695093).

Almost surely, 2^150731561 is an apocalyptic number.

It is an amenable number.

150731561 is a deficient number, since it is larger than the sum of its proper divisors (48811).

150731561 is an equidigital number, since it uses as much as digits as its factorization.

150731561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48810.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 150731561 is about 12277.2782407177. The cubic root of 150731561 is about 532.1916614437.

The spelling of 150731561 in words is "one hundred fifty million, seven hundred thirty-one thousand, five hundred sixty-one".