1651298381 has 2 divisors, whose sum is σ = 1651298382. Its totient is φ = 1651298380.

The previous prime is 1651298377. The next prime is 1651298393. The reversal of 1651298381 is 1838921561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1637497156 + 13801225 = 40466^2 + 3715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1651298381 - 2² = 1651298377 is a prime.

It is a super-2 number, since 2×1651298381² = 5453572686186442322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1651298981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825649190 + 825649191.

It is an arithmetic number, because the mean of its divisors is an integer number (825649191).

Almost surely, 2^1651298381 is an apocalyptic number.

It is an amenable number.

1651298381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651298381 is an equidigital number, since it uses as much as digits as its factorization.

1651298381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 44.

The square root of 1651298381 is about 40636.1708456887. The cubic root of 1651298381 is about 1181.9756191749.

The spelling of 1651298381 in words is "one billion, six hundred fifty-one million, two hundred ninety-eight thousand, three hundred eighty-one".