31551461 has 2 divisors, whose sum is σ = 31551462. Its totient is φ = 31551460.

The previous prime is 31551451. The next prime is 31551497. The reversal of 31551461 is 16415513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21215236 + 10336225 = 4606^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 31551461 - 2¹⁰ = 31550437 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31551461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31551431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15775730 + 15775731.

It is an arithmetic number, because the mean of its divisors is an integer number (15775731).

Almost surely, 2^31551461 is an apocalyptic number.

It is an amenable number.

31551461 is a deficient number, since it is larger than the sum of its proper divisors (1).

31551461 is an equidigital number, since it uses as much as digits as its factorization.

31551461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 26.

The square root of 31551461 is about 5617.0687195369. The cubic root of 31551461 is about 315.9898684195.

Adding to 31551461 its reverse (16415513), we get a palindrome (47966974).

The spelling of 31551461 in words is "thirty-one million, five hundred fifty-one thousand, four hundred sixty-one".