61355381 has 2 divisors, whose sum is σ = 61355382. Its totient is φ = 61355380.

The previous prime is 61355341. The next prime is 61355423. The reversal of 61355381 is 18355316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44823025 + 16532356 = 6695^2 + 4066^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61355381 is a prime.

It is a super-2 number, since 2×61355381² = 7528965555310322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61355321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30677690 + 30677691.

It is an arithmetic number, because the mean of its divisors is an integer number (30677691).

Almost surely, 2^61355381 is an apocalyptic number.

It is an amenable number.

61355381 is a deficient number, since it is larger than the sum of its proper divisors (1).

61355381 is an equidigital number, since it uses as much as digits as its factorization.

61355381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 61355381 is about 7832.9675730211. The cubic root of 61355381 is about 394.4126955395.

The spelling of 61355381 in words is "sixty-one million, three hundred fifty-five thousand, three hundred eighty-one".