150320401981 has 2 divisors, whose sum is σ = 150320401982. Its totient is φ = 150320401980.

The previous prime is 150320401961. The next prime is 150320401993. The reversal of 150320401981 is 189104023051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148617189081 + 1703212900 = 385509^2 + 41270^2 .

It is an emirp because it is prime and its reverse (189104023051) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 150320401981 - 2¹⁹ = 150319877693 is a prime.

It is a super-2 number, since 2×150320401981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (150320401951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75160200990 + 75160200991.

It is an arithmetic number, because the mean of its divisors is an integer number (75160200991).

Almost surely, 2^150320401981 is an apocalyptic number.

It is an amenable number.

150320401981 is a deficient number, since it is larger than the sum of its proper divisors (1).

150320401981 is an equidigital number, since it uses as much as digits as its factorization.

150320401981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 150320401981 in words is "one hundred fifty billion, three hundred twenty million, four hundred one thousand, nine hundred eighty-one".