231540542 has 4 divisors (see below), whose sum is σ = 347310816. Its totient is φ = 115770270.

The previous prime is 231540523. The next prime is 231540557. The reversal of 231540542 is 245045132.

It is a happy number.

231540542 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×231540542² = 107222045179307528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57885134 + ... + 57885137.

It is an arithmetic number, because the mean of its divisors is an integer number (86827704).

Almost surely, 2^231540542 is an apocalyptic number.

231540542 is a deficient number, since it is larger than the sum of its proper divisors (115770274).

231540542 is a wasteful number, since it uses less digits than its factorization.

231540542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115770273.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 231540542 is about 15216.4562891627. The cubic root of 231540542 is about 614.0574647274.

Adding to 231540542 its reverse (245045132), we get a palindrome (476585674).

The spelling of 231540542 in words is "two hundred thirty-one million, five hundred forty thousand, five hundred forty-two".