150637981 has 6 divisors (see below), whose sum is σ = 163117050. Its totient is φ = 139050288.

The previous prime is 150637979. The next prime is 150637997. The reversal of 150637981 is 189736051.

It can be written as a sum of positive squares in 3 ways, for example, as 3404025 + 147233956 = 1845^2 + 12134^2 .

It is not a de Polignac number, because 150637981 - 2¹ = 150637979 is a prime.

It is a super-2 number, since 2×150637981² = 45383602639512722, which contains 22 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 (150637951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 445506 + ... + 445843.

It is an arithmetic number, because the mean of its divisors is an integer number (27186175).

Almost surely, 2^150637981 is an apocalyptic number.

It is an amenable number.

150637981 is a deficient number, since it is larger than the sum of its proper divisors (12479069).

150637981 is an equidigital number, since it uses as much as digits as its factorization.

150637981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891375 (or 891362 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 150637981 is about 12273.4665437276. The cubic root of 150637981 is about 532.0815035680.

The spelling of 150637981 in words is "one hundred fifty million, six hundred thirty-seven thousand, nine hundred eighty-one".