151531 has 2 divisors, whose sum is σ = 151532. Its totient is φ = 151530.

The previous prime is 151523. The next prime is 151537. The reversal of 151531 is 135151.

151531 is nontrivially palindromic in base 12.

It is a strong prime.

It is an emirp because it is prime and its reverse (135151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 151531 - 2³ = 151523 is a prime.

It is a super-2 number, since 2×151531² = 45923287922, which contains 22 as substring.

151531 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (151537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75765 + 75766.

It is an arithmetic number, because the mean of its divisors is an integer number (75766).

2¹⁵¹⁵³¹ is an apocalyptic number.

151531 is a deficient number, since it is larger than the sum of its proper divisors (1).

151531 is an equidigital number, since it uses as much as digits as its factorization.

151531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75, while the sum is 16.

The square root of 151531 is about 389.2698292958. The cubic root of 151531 is about 53.3130869331.

Adding to 151531 its reverse (135151), we get a palindrome (286682).

The spelling of 151531 in words is "one hundred fifty-one thousand, five hundred thirty-one".