31142402 has 16 divisors (see below), whose sum is σ = 49571352. Its totient is φ = 14622720.

The previous prime is 31142401. The next prime is 31142413. The reversal of 31142402 is 20424113.

It can be written as a sum of positive squares in 4 ways, for example, as 23629321 + 7513081 = 4861^2 + 2741^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (31142401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22202 + ... + 23562.

Almost surely, 2^31142402 is an apocalyptic number.

31142402 is a deficient number, since it is larger than the sum of its proper divisors (18428950).

31142402 is a wasteful number, since it uses less digits than its factorization.

31142402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 31142402 is about 5580.5377877047. The cubic root of 31142402 is about 314.6183401457.

Adding to 31142402 its reverse (20424113), we get a palindrome (51566515).

The spelling of 31142402 in words is "thirty-one million, one hundred forty-two thousand, four hundred two".