31358461 has 4 divisors (see below), whose sum is σ = 31496832. Its totient is φ = 31220092.

The previous prime is 31358449. The next prime is 31358471. The reversal of 31358461 is 16485313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31358461 - 2¹⁷ = 31227389 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31358401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68845 + ... + 69298.

It is an arithmetic number, because the mean of its divisors is an integer number (7874208).

Almost surely, 2^31358461 is an apocalyptic number.

It is an amenable number.

31358461 is a deficient number, since it is larger than the sum of its proper divisors (138371).

31358461 is a wasteful number, since it uses less digits than its factorization.

31358461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138370.

The product of its digits is 8640, while the sum is 31.

The square root of 31358461 is about 5599.8625875998. The cubic root of 31358461 is about 315.3442478223.

The spelling of 31358461 in words is "thirty-one million, three hundred fifty-eight thousand, four hundred sixty-one".