31125403 has 2 divisors, whose sum is σ = 31125404. Its totient is φ = 31125402.

The previous prime is 31125397. The next prime is 31125427. The reversal of 31125403 is 30452113.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31125403 is a prime.

It is not a weakly prime, because it can be changed into another prime (31125443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15562701 + 15562702.

It is an arithmetic number, because the mean of its divisors is an integer number (15562702).

Almost surely, 2^31125403 is an apocalyptic number.

31125403 is a deficient number, since it is larger than the sum of its proper divisors (1).

31125403 is an equidigital number, since it uses as much as digits as its factorization.

31125403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 31125403 is about 5579.0145187121. The cubic root of 31125403 is about 314.5610851898.

Adding to 31125403 its reverse (30452113), we get a palindrome (61577516).

It can be divided in two parts, 3112 and 5403, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 31125403 in words is "thirty-one million, one hundred twenty-five thousand, four hundred three".