61071091 has 2 divisors, whose sum is σ = 61071092. Its totient is φ = 61071090.

The previous prime is 61071079. The next prime is 61071119. The reversal of 61071091 is 19017016.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61071091 is a prime.

It is not a weakly prime, because it can be changed into another prime (61071691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30535545 + 30535546.

It is an arithmetic number, because the mean of its divisors is an integer number (30535546).

Almost surely, 2^61071091 is an apocalyptic number.

61071091 is a deficient number, since it is larger than the sum of its proper divisors (1).

61071091 is an equidigital number, since it uses as much as digits as its factorization.

61071091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 61071091 is about 7814.7994855914. The cubic root of 61071091 is about 393.8025821774.

The spelling of 61071091 in words is "sixty-one million, seventy-one thousand, ninety-one".