149990399981 has 2 divisors, whose sum is σ = 149990399982. Its totient is φ = 149990399980.

The previous prime is 149990399947. The next prime is 149990400013. The reversal of 149990399981 is 189993099941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138436084900 + 11554315081 = 372070^2 + 107491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149990399981 is a prime.

It is a super-2 number, since 2×149990399981² (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 (149990399921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74995199990 + 74995199991.

It is an arithmetic number, because the mean of its divisors is an integer number (74995199991).

Almost surely, 2^149990399981 is an apocalyptic number.

It is an amenable number.

149990399981 is a deficient number, since it is larger than the sum of its proper divisors (1).

149990399981 is an equidigital number, since it uses as much as digits as its factorization.

149990399981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51018336, while the sum is 71.

The spelling of 149990399981 in words is "one hundred forty-nine billion, nine hundred ninety million, three hundred ninety-nine thousand, nine hundred eighty-one".