148781 has 2 divisors, whose sum is σ = 148782. Its totient is φ = 148780.

The previous prime is 148763. The next prime is 148783. The reversal of 148781 is 187841.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136900 + 11881 = 370^2 + 109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-148781 is a prime.

It is a super-2 number, since 2×148781² = 44271571922, which contains 22 as substring.

Together with 148783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (148783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74390 + 74391.

It is an arithmetic number, because the mean of its divisors is an integer number (74391).

2¹⁴⁸⁷⁸¹ is an apocalyptic number.

148781 is the 173-rd centered decagonal number.

It is an amenable number.

148781 is a deficient number, since it is larger than the sum of its proper divisors (1).

148781 is an equidigital number, since it uses as much as digits as its factorization.

148781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 29.

The square root of 148781 is about 385.7214020508. The cubic root of 148781 is about 52.9886055961.

Subtracting 148781 from its reverse (187841), we obtain a triangular number (39060 = T₂₇₉).

It can be divided in two parts, 148 and 781, that added together give a palindrome (929).

The spelling of 148781 in words is "one hundred forty-eight thousand, seven hundred eighty-one".