231621542 has 4 divisors (see below), whose sum is σ = 347432316. Its totient is φ = 115810770.

The previous prime is 231621541. The next prime is 231621557. The reversal of 231621542 is 245126132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231621541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57905384 + ... + 57905387.

It is an arithmetic number, because the mean of its divisors is an integer number (86858079).

Almost surely, 2^231621542 is an apocalyptic number.

231621542 is a deficient number, since it is larger than the sum of its proper divisors (115810774).

231621542 is a wasteful number, since it uses less digits than its factorization.

231621542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115810773.

The product of its digits is 2880, while the sum is 26.

The square root of 231621542 is about 15219.1176485367. The cubic root of 231621542 is about 614.1290617723.

Adding to 231621542 its reverse (245126132), we get a palindrome (476747674).

The spelling of 231621542 in words is "two hundred thirty-one million, six hundred twenty-one thousand, five hundred forty-two".