61231481 has 2 divisors, whose sum is σ = 61231482. Its totient is φ = 61231480.

The previous prime is 61231453. The next prime is 61231487. The reversal of 61231481 is 18413216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56010256 + 5221225 = 7484^2 + 2285^2 .

It is a cyclic number.

It is not a de Polignac number, because 61231481 - 2¹⁰ = 61230457 is a prime.

It is a super-2 number, since 2×61231481² = 7498588530906722, which contains 22 as substring.

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 61231481.

It is not a weakly prime, because it can be changed into another prime (61231487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30615740 + 30615741.

It is an arithmetic number, because the mean of its divisors is an integer number (30615741).

Almost surely, 2^61231481 is an apocalyptic number.

It is an amenable number.

61231481 is a deficient number, since it is larger than the sum of its proper divisors (1).

61231481 is an equidigital number, since it uses as much as digits as its factorization.

61231481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 61231481 is about 7825.0546962945. The cubic root of 61231481 is about 394.1470265612.

Adding to 61231481 its reverse (18413216), we get a palindrome (79644697).

The spelling of 61231481 in words is "sixty-one million, two hundred thirty-one thousand, four hundred eighty-one".