150101981 has 2 divisors, whose sum is σ = 150101982. Its totient is φ = 150101980.

The previous prime is 150101977. The next prime is 150102011. The reversal of 150101981 is 189101051.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104755225 + 45346756 = 10235^2 + 6734^2 .

It is an emirp because it is prime and its reverse (189101051) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 150101981 - 2² = 150101977 is a prime.

It is a super-2 number, since 2×150101981² = 45061209400248722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 150101981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (150101911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75050990 + 75050991.

It is an arithmetic number, because the mean of its divisors is an integer number (75050991).

Almost surely, 2^150101981 is an apocalyptic number.

It is an amenable number.

150101981 is a deficient number, since it is larger than the sum of its proper divisors (1).

150101981 is an equidigital number, since it uses as much as digits as its factorization.

150101981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 26.

The square root of 150101981 is about 12251.6113634085. The cubic root of 150101981 is about 531.4496695172.

The spelling of 150101981 in words is "one hundred fifty million, one hundred one thousand, nine hundred eighty-one".