31540154121 has 12 divisors (see below), whose sum is σ = 52066286272. Its totient is φ = 18022945176.

The previous prime is 31540154117. The next prime is 31540154141. The reversal of 31540154121 is 12145104513.

It is not a de Polignac number, because 31540154121 - 2² = 31540154117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31540154141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250318621 + ... + 250318746.

Almost surely, 2^31540154121 is an apocalyptic number.

It is an amenable number.

31540154121 is a deficient number, since it is larger than the sum of its proper divisors (20526132151).

31540154121 is a wasteful number, since it uses less digits than its factorization.

31540154121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500637380 (or 500637377 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 31540154121 its reverse (12145104513), we get a palindrome (43685258634).

The spelling of 31540154121 in words is "thirty-one billion, five hundred forty million, one hundred fifty-four thousand, one hundred twenty-one".