61000500991 has 2 divisors, whose sum is σ = 61000500992. Its totient is φ = 61000500990.

The previous prime is 61000500931. The next prime is 61000501061. The reversal of 61000500991 is 19900500016.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61000500991 - 2¹³ = 61000492799 is a prime.

It is a super-2 number, since 2×61000500991² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61000500931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30500250495 + 30500250496.

It is an arithmetic number, because the mean of its divisors is an integer number (30500250496).

Almost surely, 2^61000500991 is an apocalyptic number.

61000500991 is a deficient number, since it is larger than the sum of its proper divisors (1).

61000500991 is an equidigital number, since it uses as much as digits as its factorization.

61000500991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 31.

The spelling of 61000500991 in words is "sixty-one billion, five hundred thousand, nine hundred ninety-one".