31540154 has 4 divisors (see below), whose sum is σ = 47310234. Its totient is φ = 15770076.

The previous prime is 31540147. The next prime is 31540163. The reversal of 31540154 is 45104513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45104513 = 503 ⋅89671.

It can be written as a sum of positive squares in only one way, i.e., 21836929 + 9703225 = 4673^2 + 3115^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7885037 + ... + 7885040.

Almost surely, 2^31540154 is an apocalyptic number.

31540154 is a deficient number, since it is larger than the sum of its proper divisors (15770080).

31540154 is a wasteful number, since it uses less digits than its factorization.

31540154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15770079.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 31540154 is about 5616.0621435308. The cubic root of 31540154 is about 315.9521171372.

Adding to 31540154 its reverse (45104513), we get a palindrome (76644667).

The spelling of 31540154 in words is "thirty-one million, five hundred forty thousand, one hundred fifty-four".