31242154 has 4 divisors (see below), whose sum is σ = 46863234. Its totient is φ = 15621076.

The previous prime is 31242149. The next prime is 31242157. The reversal of 31242154 is 45124213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45124213 = 733 ⋅61561.

It can be written as a sum of positive squares in only one way, i.e., 29866225 + 1375929 = 5465^2 + 1173^2 .

It is not an unprimeable number, because it can be changed into a prime (31242157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7810537 + ... + 7810540.

Almost surely, 2^31242154 is an apocalyptic number.

31242154 is a deficient number, since it is larger than the sum of its proper divisors (15621080).

31242154 is a wasteful number, since it uses less digits than its factorization.

31242154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15621079.

The product of its digits is 960, while the sum is 22.

The square root of 31242154 is about 5589.4681321213. The cubic root of 31242154 is about 314.9538993591.

Adding to 31242154 its reverse (45124213), we get a palindrome (76366367).

The spelling of 31242154 in words is "thirty-one million, two hundred forty-two thousand, one hundred fifty-four".