31653145 has 16 divisors (see below), whose sum is σ = 40587840. Its totient is φ = 23626944.

The previous prime is 31653143. The next prime is 31653151. The reversal of 31653145 is 54135613.

It is a cyclic number.

It is not a de Polignac number, because 31653145 - 2¹ = 31653143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31653143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3879 + ... + 8851.

It is an arithmetic number, because the mean of its divisors is an integer number (2536740).

Almost surely, 2^31653145 is an apocalyptic number.

It is an amenable number.

31653145 is a deficient number, since it is larger than the sum of its proper divisors (8934695).

31653145 is a wasteful number, since it uses less digits than its factorization.

31653145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5064.

The product of its digits is 5400, while the sum is 28.

The square root of 31653145 is about 5626.1127788198. The cubic root of 31653145 is about 316.3289616243.

Adding to 31653145 its reverse (54135613), we get a palindrome (85788758).

The spelling of 31653145 in words is "thirty-one million, six hundred fifty-three thousand, one hundred forty-five".