1613423261 has 2 divisors, whose sum is σ = 1613423262. Its totient is φ = 1613423260.

The previous prime is 1613423249. The next prime is 1613423293. The reversal of 1613423261 is 1623243161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1013467225 + 599956036 = 31835^2 + 24494^2 .

It is a cyclic number.

It is not a de Polignac number, because 1613423261 - 2⁶ = 1613423197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1613413261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806711630 + 806711631.

It is an arithmetic number, because the mean of its divisors is an integer number (806711631).

Almost surely, 2^1613423261 is an apocalyptic number.

It is an amenable number.

1613423261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1613423261 is an equidigital number, since it uses as much as digits as its factorization.

1613423261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 1613423261 is about 40167.4403092853. The cubic root of 1613423261 is about 1172.8688118934.

The spelling of 1613423261 in words is "one billion, six hundred thirteen million, four hundred twenty-three thousand, two hundred sixty-one".