31012261 has 8 divisors (see below), whose sum is σ = 36111744. Its totient is φ = 26080080.

The previous prime is 31012243. The next prime is 31012273. The reversal of 31012261 is 16221013.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31012261 - 2⁷ = 31012133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41425 + ... + 42166.

It is an arithmetic number, because the mean of its divisors is an integer number (4513968).

Almost surely, 2^31012261 is an apocalyptic number.

It is an amenable number.

31012261 is a deficient number, since it is larger than the sum of its proper divisors (5099483).

31012261 is an equidigital number, since it uses as much as digits as its factorization.

31012261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83651.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 31012261 is about 5568.8653242829. The cubic root of 31012261 is about 314.1794753373.

Adding to 31012261 its reverse (16221013), we get a palindrome (47233274).

The spelling of 31012261 in words is "thirty-one million, twelve thousand, two hundred sixty-one".