149731 has 2 divisors, whose sum is σ = 149732. Its totient is φ = 149730.

The previous prime is 149729. The next prime is 149749. The reversal of 149731 is 137941.

It is a weak prime.

It is an emirp because it is prime and its reverse (137941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149731 - 2¹ = 149729 is a prime.

It is a super-2 number, since 2×149731² = 44838744722, which contains 22 as substring.

Together with 149729, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 149696 and 149705.

It is not a weakly prime, because it can be changed into another prime (149711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74865 + 74866.

It is an arithmetic number, because the mean of its divisors is an integer number (74866).

2¹⁴⁹⁷³¹ is an apocalyptic number.

149731 is a deficient number, since it is larger than the sum of its proper divisors (1).

149731 is an equidigital number, since it uses as much as digits as its factorization.

149731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 25.

The square root of 149731 is about 386.9509012782. The cubic root of 149731 is about 53.1011477699.

The spelling of 149731 in words is "one hundred forty-nine thousand, seven hundred thirty-one".