31249061 has 4 divisors (see below), whose sum is σ = 31328172. Its totient is φ = 31169952.

The previous prime is 31249051. The next prime is 31249073. The reversal of 31249061 is 16094213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16094213 = 331 ⋅48623.

It can be written as a sum of positive squares in 2 ways, for example, as 21104836 + 10144225 = 4594^2 + 3185^2 .

It is a cyclic number.

It is not a de Polignac number, because 31249061 - 2²² = 27054757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31249061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31249021) 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, 38960 + ... + 39753.

It is an arithmetic number, because the mean of its divisors is an integer number (7832043).

Almost surely, 2^31249061 is an apocalyptic number.

It is an amenable number.

31249061 is a deficient number, since it is larger than the sum of its proper divisors (79111).

31249061 is an equidigital number, since it uses as much as digits as its factorization.

31249061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79110.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 31249061 is about 5590.0859564053. The cubic root of 31249061 is about 314.9771075998.

The spelling of 31249061 in words is "thirty-one million, two hundred forty-nine thousand, sixty-one".