1630454381 has 2 divisors, whose sum is σ = 1630454382. Its totient is φ = 1630454380.

The previous prime is 1630454333. The next prime is 1630454431. The reversal of 1630454381 is 1834540361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1126676356 + 503778025 = 33566^2 + 22445^2 .

It is an emirp because it is prime and its reverse (1834540361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1630454381 - 2¹⁴ = 1630437997 is a prime.

It is a super-2 number, since 2×1630454381² = 5316762977044186322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1630453381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815227190 + 815227191.

It is an arithmetic number, because the mean of its divisors is an integer number (815227191).

Almost surely, 2^1630454381 is an apocalyptic number.

It is an amenable number.

1630454381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630454381 is an equidigital number, since it uses as much as digits as its factorization.

1630454381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1630454381 is about 40378.8853362745. The cubic root of 1630454381 is about 1176.9812672082.

The spelling of 1630454381 in words is "one billion, six hundred thirty million, four hundred fifty-four thousand, three hundred eighty-one".