61370143 has 2 divisors, whose sum is σ = 61370144. Its totient is φ = 61370142.

The previous prime is 61370137. The next prime is 61370147. The reversal of 61370143 is 34107316.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61370143 - 2²¹ = 59272991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61370147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30685071 + 30685072.

It is an arithmetic number, because the mean of its divisors is an integer number (30685072).

Almost surely, 2^61370143 is an apocalyptic number.

61370143 is a deficient number, since it is larger than the sum of its proper divisors (1).

61370143 is an equidigital number, since it uses as much as digits as its factorization.

61370143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 61370143 is about 7833.9098156668. The cubic root of 61370143 is about 394.4443246769. Note that the first 3 decimals are identical.

Adding to 61370143 its reverse (34107316), we get a palindrome (95477459).

It can be divided in two parts, 613 and 70143, that added together give a square (70756 = 266²).

The spelling of 61370143 in words is "sixty-one million, three hundred seventy thousand, one hundred forty-three".