31378453 has 2 divisors, whose sum is σ = 31378454. Its totient is φ = 31378452.

The previous prime is 31378423. The next prime is 31378471. The reversal of 31378453 is 35487313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26811684 + 4566769 = 5178^2 + 2137^2 .

It is a cyclic number.

It is not a de Polignac number, because 31378453 - 2⁵ = 31378421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31378423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15689226 + 15689227.

It is an arithmetic number, because the mean of its divisors is an integer number (15689227).

Almost surely, 2^31378453 is an apocalyptic number.

It is an amenable number.

31378453 is a deficient number, since it is larger than the sum of its proper divisors (1).

31378453 is an equidigital number, since it uses as much as digits as its factorization.

31378453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 34.

The square root of 31378453 is about 5601.6473469864. The cubic root of 31378453 is about 315.4112475276.

The spelling of 31378453 in words is "thirty-one million, three hundred seventy-eight thousand, four hundred fifty-three".