150997521 has 4 divisors (see below), whose sum is σ = 201330032. Its totient is φ = 100665012.

The previous prime is 150997471. The next prime is 150997529. The reversal of 150997521 is 125799051.

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 not a de Polignac number, because 150997521 - 2⁷ = 150997393 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 150997521.

It is not an unprimeable number, because it can be changed into a prime (150997529) 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, 25166251 + ... + 25166256.

It is an arithmetic number, because the mean of its divisors is an integer number (50332508).

Almost surely, 2^150997521 is an apocalyptic number.

It is an amenable number.

150997521 is a deficient number, since it is larger than the sum of its proper divisors (50332511).

150997521 is an equidigital number, since it uses as much as digits as its factorization.

150997521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50332510.

The product of its (nonzero) digits is 28350, while the sum is 39.

The square root of 150997521 is about 12288.1048579510. The cubic root of 150997521 is about 532.5044880488.

The spelling of 150997521 in words is "one hundred fifty million, nine hundred ninety-seven thousand, five hundred twenty-one".