150556561 has 4 divisors (see below), whose sum is σ = 151655652. Its totient is φ = 149457472.

The previous prime is 150556547. The next prime is 150556579. The reversal of 150556561 is 165655051.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64883025 + 85673536 = 8055^2 + 9256^2 .

It is a cyclic number.

It is not a de Polignac number, because 150556561 - 2⁵ = 150556529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (150556501) 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, 549340 + ... + 549613.

It is an arithmetic number, because the mean of its divisors is an integer number (37913913).

Almost surely, 2^150556561 is an apocalyptic number.

It is an amenable number.

150556561 is a deficient number, since it is larger than the sum of its proper divisors (1099091).

150556561 is a wasteful number, since it uses less digits than its factorization.

150556561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099090.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 150556561 is about 12270.1491840972. The cubic root of 150556561 is about 531.9856227388.

The spelling of 150556561 in words is "one hundred fifty million, five hundred fifty-six thousand, five hundred sixty-one".