61800971 has 2 divisors, whose sum is σ = 61800972. Its totient is φ = 61800970.

The previous prime is 61800941. The next prime is 61800983. The reversal of 61800971 is 17900816.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61800971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61800941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30900485 + 30900486.

It is an arithmetic number, because the mean of its divisors is an integer number (30900486).

Almost surely, 2^61800971 is an apocalyptic number.

61800971 is a deficient number, since it is larger than the sum of its proper divisors (1).

61800971 is an equidigital number, since it uses as much as digits as its factorization.

61800971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 61800971 is about 7861.3593608230. The cubic root of 61800971 is about 395.3651934248.

The spelling of 61800971 in words is "sixty-one million, eight hundred thousand, nine hundred seventy-one".