61237993 has 2 divisors, whose sum is σ = 61237994. Its totient is φ = 61237992.

The previous prime is 61237991. The next prime is 61238033. The reversal of 61237993 is 39973216.

It is an a-pointer prime, because the next prime (61238033) can be obtained adding 61237993 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60715264 + 522729 = 7792^2 + 723^2 .

It is a cyclic number.

It is not a de Polignac number, because 61237993 - 2¹ = 61237991 is a prime.

Together with 61237991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61237991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30618996 + 30618997.

It is an arithmetic number, because the mean of its divisors is an integer number (30618997).

Almost surely, 2^61237993 is an apocalyptic number.

It is an amenable number.

61237993 is a deficient number, since it is larger than the sum of its proper divisors (1).

61237993 is an equidigital number, since it uses as much as digits as its factorization.

61237993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 40.

The square root of 61237993 is about 7825.4707845599. The cubic root of 61237993 is about 394.1609986466.

The spelling of 61237993 in words is "sixty-one million, two hundred thirty-seven thousand, nine hundred ninety-three".