31456661420549 has 2 divisors, whose sum is σ = 31456661420550. Its totient is φ = 31456661420548.

The previous prime is 31456661420543. The next prime is 31456661420557. The reversal of 31456661420549 is 94502416665413.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30729205952449 + 727455468100 = 5543393^2 + 852910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31456661420549 is a prime.

It is a super-2 number, since 2×31456661420549² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31456661420494 and 31456661420503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31456661420543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15728330710274 + 15728330710275.

It is an arithmetic number, because the mean of its divisors is an integer number (15728330710275).

Almost surely, 2^{31456661420549} is an apocalyptic number.

It is an amenable number.

31456661420549 is a deficient number, since it is larger than the sum of its proper divisors (1).

31456661420549 is an equidigital number, since it uses as much as digits as its factorization.

31456661420549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18662400, while the sum is 56.

The spelling of 31456661420549 in words is "thirty-one trillion, four hundred fifty-six billion, six hundred sixty-one million, four hundred twenty thousand, five hundred forty-nine".