149491745281 has 2 divisors, whose sum is σ = 149491745282. Its totient is φ = 149491745280.

The previous prime is 149491745279. The next prime is 149491745341. The reversal of 149491745281 is 182547194941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143656160400 + 5835584881 = 379020^2 + 76391^2 .

It is a cyclic number.

It is not a de Polignac number, because 149491745281 - 2¹ = 149491745279 is a prime.

It is a super-2 number, since 2×149491745281² (a number of 23 digits) contains 22 as substring.

Together with 149491745279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (149491745981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74745872640 + 74745872641.

It is an arithmetic number, because the mean of its divisors is an integer number (74745872641).

Almost surely, 2^149491745281 is an apocalyptic number.

It is an amenable number.

149491745281 is a deficient number, since it is larger than the sum of its proper divisors (1).

149491745281 is an equidigital number, since it uses as much as digits as its factorization.

149491745281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 55.

The spelling of 149491745281 in words is "one hundred forty-nine billion, four hundred ninety-one million, seven hundred forty-five thousand, two hundred eighty-one".