1894164521 has 2 divisors, whose sum is σ = 1894164522. Its totient is φ = 1894164520.

The previous prime is 1894164479. The next prime is 1894164529. The reversal of 1894164521 is 1254614981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1458858025 + 435306496 = 38195^2 + 20864^2 .

It is a cyclic number.

It is not a de Polignac number, because 1894164521 - 2²² = 1889970217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1894164529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 947082260 + 947082261.

It is an arithmetic number, because the mean of its divisors is an integer number (947082261).

Almost surely, 2^1894164521 is an apocalyptic number.

It is an amenable number.

1894164521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1894164521 is an equidigital number, since it uses as much as digits as its factorization.

1894164521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 1894164521 is about 43522.0004250724. Note that the first 3 decimals coincide. The cubic root of 1894164521 is about 1237.2930284884.

The spelling of 1894164521 in words is "one billion, eight hundred ninety-four million, one hundred sixty-four thousand, five hundred twenty-one".