61000091 has 2 divisors, whose sum is σ = 61000092. Its totient is φ = 61000090.

The previous prime is 61000039. The next prime is 61000111. The reversal of 61000091 is 19000016.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61000091 - 2¹⁰ = 60999067 is a prime.

It is a super-2 number, since 2×61000091² = 7442022204016562, which contains 22 as substring.

61000091 is a modest number, since divided by 91 gives 61 as remainder.

It is not a weakly prime, because it can be changed into another prime (61000001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30500045 + 30500046.

It is an arithmetic number, because the mean of its divisors is an integer number (30500046).

Almost surely, 2^61000091 is an apocalyptic number.

61000091 is a deficient number, since it is larger than the sum of its proper divisors (1).

61000091 is an equidigital number, since it uses as much as digits as its factorization.

61000091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 61000091 is about 7810.2555015825. The cubic root of 61000091 is about 393.6499140594.

The spelling of 61000091 in words is "sixty-one million, ninety-one", and thus it is an aban number and an uban number.