61009131923 has 2 divisors, whose sum is σ = 61009131924. Its totient is φ = 61009131922.

The previous prime is 61009131893. The next prime is 61009132001. The reversal of 61009131923 is 32913190016.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61009131923 - 2¹⁰ = 61009130899 is a prime.

It is a super-2 number, since 2×61009131923² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61009131023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30504565961 + 30504565962.

It is an arithmetic number, because the mean of its divisors is an integer number (30504565962).

Almost surely, 2^61009131923 is an apocalyptic number.

61009131923 is a deficient number, since it is larger than the sum of its proper divisors (1).

61009131923 is an equidigital number, since it uses as much as digits as its factorization.

61009131923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The spelling of 61009131923 in words is "sixty-one billion, nine million, one hundred thirty-one thousand, nine hundred twenty-three".