151831 has 4 divisors (see below), whose sum is σ = 153000. Its totient is φ = 150664.

The previous prime is 151817. The next prime is 151841. The reversal of 151831 is 138151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138151 = 13 ⋅10627.

It is a cyclic number.

It is not a de Polignac number, because 151831 - 2⁵ = 151799 is a prime.

It is a super-2 number, since 2×151831² = 46105305122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 151799 and 151808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361 + ... + 658.

It is an arithmetic number, because the mean of its divisors is an integer number (38250).

2¹⁵¹⁸³¹ is an apocalyptic number.

151831 is a deficient number, since it is larger than the sum of its proper divisors (1169).

151831 is a wasteful number, since it uses less digits than its factorization.

151831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168.

The product of its digits is 120, while the sum is 19.

The square root of 151831 is about 389.6549755874. The cubic root of 151831 is about 53.3482466975.

Adding to 151831 its reverse (138151), we get a palindrome (289982).

The spelling of 151831 in words is "one hundred fifty-one thousand, eight hundred thirty-one".