151231631 has 4 divisors (see below), whose sum is σ = 154085112. Its totient is φ = 148378152.

The previous prime is 151231603. The next prime is 151231649. The reversal of 151231631 is 136132151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136132151 = 313 ⋅434927.

It is a cyclic number.

It is not a de Polignac number, because 151231631 - 2⁶ = 151231567 is a prime.

It is a super-2 number, since 2×151231631² = 45742012429840322, 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 = 151231597 and 151231606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151231651) 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 in 3 ways as a sum of consecutive naturals, for example, 1426661 + ... + 1426766.

It is an arithmetic number, because the mean of its divisors is an integer number (38521278).

Almost surely, 2^151231631 is an apocalyptic number.

151231631 is a deficient number, since it is larger than the sum of its proper divisors (2853481).

151231631 is an equidigital number, since it uses as much as digits as its factorization.

151231631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2853480.

The product of its digits is 540, while the sum is 23.

The square root of 151231631 is about 12297.6270475242. The cubic root of 151231631 is about 532.7795483117.

Adding to 151231631 its reverse (136132151), we get a palindrome (287363782).

The spelling of 151231631 in words is "one hundred fifty-one million, two hundred thirty-one thousand, six hundred thirty-one".