231545430121555 has 64 divisors (see below), whose sum is σ = 337845022225920. Its totient is φ = 150145373952000.

The previous prime is 231545430121477. The next prime is 231545430121573. The reversal of 231545430121555 is 555121034545132.

It is not a de Polignac number, because 231545430121555 - 2¹⁹ = 231545429597267 is a prime.

It is a super-2 number, since 2×231545430121555² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 764400880 + ... + 764703730.

It is an arithmetic number, because the mean of its divisors is an integer number (5278828472280).

Almost surely, 2^{231545430121555} is an apocalyptic number.

231545430121555 is a deficient number, since it is larger than the sum of its proper divisors (106299592104365).

231545430121555 is a wasteful number, since it uses less digits than its factorization.

231545430121555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345940.

The product of its (nonzero) digits is 1800000, while the sum is 46.

Adding to 231545430121555 its reverse (555121034545132), we get a palindrome (786666464666687).

The spelling of 231545430121555 in words is "two hundred thirty-one trillion, five hundred forty-five billion, four hundred thirty million, one hundred twenty-one thousand, five hundred fifty-five".