149631281 has 2 divisors, whose sum is σ = 149631282. Its totient is φ = 149631280.

The previous prime is 149631269. The next prime is 149631299. The reversal of 149631281 is 182136941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101203600 + 48427681 = 10060^2 + 6959^2 .

It is a cyclic number.

It is not a de Polignac number, because 149631281 - 2²⁶ = 82522417 is a prime.

It is a super-2 number, since 2×149631281² = 44779040507401922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (149631241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74815640 + 74815641.

It is an arithmetic number, because the mean of its divisors is an integer number (74815641).

Almost surely, 2^149631281 is an apocalyptic number.

It is an amenable number.

149631281 is a deficient number, since it is larger than the sum of its proper divisors (1).

149631281 is an equidigital number, since it uses as much as digits as its factorization.

149631281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 149631281 is about 12232.3865619101. The cubic root of 149631281 is about 530.8935691537.

The spelling of 149631281 in words is "one hundred forty-nine million, six hundred thirty-one thousand, two hundred eighty-one".