61212733913 has 2 divisors, whose sum is σ = 61212733914. Its totient is φ = 61212733912.

The previous prime is 61212733891. The next prime is 61212733931. The reversal of 61212733913 is 31933721216.

Together with next prime (61212733931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45534438544 + 15678295369 = 213388^2 + 125213^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61212733913 is a prime.

It is not a weakly prime, because it can be changed into another prime (61212733963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30606366956 + 30606366957.

It is an arithmetic number, because the mean of its divisors is an integer number (30606366957).

Almost surely, 2^61212733913 is an apocalyptic number.

It is an amenable number.

61212733913 is a deficient number, since it is larger than the sum of its proper divisors (1).

61212733913 is an equidigital number, since it uses as much as digits as its factorization.

61212733913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 38.

The spelling of 61212733913 in words is "sixty-one billion, two hundred twelve million, seven hundred thirty-three thousand, nine hundred thirteen".