158961131 has 8 divisors (see below), whose sum is σ = 183337440. Its totient is φ = 135001728.

The previous prime is 158961109. The next prime is 158961133. The reversal of 158961131 is 131169851.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158961131 is a prime.

It is a super-2 number, since 2×158961131² = 50537282337598322, 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 = 158961091 and 158961100.

It is not an unprimeable number, because it can be changed into a prime (158961133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103406 + ... + 104931.

It is an arithmetic number, because the mean of its divisors is an integer number (22917180).

Almost surely, 2^158961131 is an apocalyptic number.

158961131 is a deficient number, since it is larger than the sum of its proper divisors (24376309).

158961131 is a wasteful number, since it uses less digits than its factorization.

158961131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208453.

The product of its digits is 6480, while the sum is 35.

The square root of 158961131 is about 12607.9788626092. The cubic root of 158961131 is about 541.7060026450.

The spelling of 158961131 in words is "one hundred fifty-eight million, nine hundred sixty-one thousand, one hundred thirty-one".