61223381 has 2 divisors, whose sum is σ = 61223382. Its totient is φ = 61223380.

The previous prime is 61223329. The next prime is 61223387. The reversal of 61223381 is 18332216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49210225 + 12013156 = 7015^2 + 3466^2 .

It is a cyclic number.

It is not a de Polignac number, because 61223381 - 2⁶ = 61223317 is a prime.

It is a super-2 number, since 2×61223381² = 7496604762142322, 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 61223381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61223387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30611690 + 30611691.

It is an arithmetic number, because the mean of its divisors is an integer number (30611691).

Almost surely, 2^61223381 is an apocalyptic number.

It is an amenable number.

61223381 is a deficient number, since it is larger than the sum of its proper divisors (1).

61223381 is an equidigital number, since it uses as much as digits as its factorization.

61223381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 61223381 is about 7824.5371109095. The cubic root of 61223381 is about 394.1296458955.

Adding to 61223381 its reverse (18332216), we get a palindrome (79555597).

The spelling of 61223381 in words is "sixty-one million, two hundred twenty-three thousand, three hundred eighty-one".