1613264381 has 2 divisors, whose sum is σ = 1613264382. Its totient is φ = 1613264380.

The previous prime is 1613264357. The next prime is 1613264489. The reversal of 1613264381 is 1834623161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1467579481 + 145684900 = 38309^2 + 12070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1613264381 is a prime.

It is a super-2 number, since 2×1613264381² = 5205243926006626322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1613264311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806632190 + 806632191.

It is an arithmetic number, because the mean of its divisors is an integer number (806632191).

Almost surely, 2^1613264381 is an apocalyptic number.

It is an amenable number.

1613264381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1613264381 is an equidigital number, since it uses as much as digits as its factorization.

1613264381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 1613264381 is about 40165.4625393509. The cubic root of 1613264381 is about 1172.8303116605.

The spelling of 1613264381 in words is "one billion, six hundred thirteen million, two hundred sixty-four thousand, three hundred eighty-one".