31242153 has 8 divisors (see below), whose sum is σ = 41710816. Its totient is φ = 20800800.

The previous prime is 31242149. The next prime is 31242157. The reversal of 31242153 is 35124213.

It is an interprime number because it is at equal distance from previous prime (31242149) and next prime (31242157).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31242153 - 2² = 31242149 is a prime.

It is a Duffinian number.

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 in 7 ways as a sum of consecutive naturals, for example, 3988 + ... + 8853.

It is an arithmetic number, because the mean of its divisors is an integer number (5213852).

Almost surely, 2^31242153 is an apocalyptic number.

It is an amenable number.

31242153 is a deficient number, since it is larger than the sum of its proper divisors (10468663).

31242153 is a wasteful number, since it uses less digits than its factorization.

31242153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13655.

The product of its digits is 720, while the sum is 21.

The square root of 31242153 is about 5589.4680426674. The cubic root of 31242153 is about 314.9538959987.

Adding to 31242153 its reverse (35124213), we get a palindrome (66366366).

The spelling of 31242153 in words is "thirty-one million, two hundred forty-two thousand, one hundred fifty-three".