31033145 has 16 divisors (see below), whose sum is σ = 43751232. Its totient is φ = 20832960.

The previous prime is 31033133. The next prime is 31033157. The reversal of 31033145 is 54133013.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31033133) and next prime (31033157).

It is not a de Polignac number, because 31033145 - 2¹⁴ = 31016761 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20987 + ... + 22416.

It is an arithmetic number, because the mean of its divisors is an integer number (2734452).

Almost surely, 2^31033145 is an apocalyptic number.

It is an amenable number.

31033145 is a deficient number, since it is larger than the sum of its proper divisors (12718087).

31033145 is a wasteful number, since it uses less digits than its factorization.

31033145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43432.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 31033145 is about 5570.7400765069. The cubic root of 31033145 is about 314.2499834921.

Adding to 31033145 its reverse (54133013), we get a palindrome (85166158).

The spelling of 31033145 in words is "thirty-one million, thirty-three thousand, one hundred forty-five".