1917046121 has 2 divisors, whose sum is σ = 1917046122. Its totient is φ = 1917046120.

The previous prime is 1917046049. The next prime is 1917046139. The reversal of 1917046121 is 1216407191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1516245721 + 400800400 = 38939^2 + 20020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1917046121 is a prime.

It is a super-2 number, since 2×1917046121² = 7350131660082293282, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1917046151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958523060 + 958523061.

It is an arithmetic number, because the mean of its divisors is an integer number (958523061).

Almost surely, 2^1917046121 is an apocalyptic number.

It is an amenable number.

1917046121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1917046121 is an equidigital number, since it uses as much as digits as its factorization.

1917046121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 1917046121 is about 43784.0852479528. The cubic root of 1917046121 is about 1242.2552871181.

The spelling of 1917046121 in words is "one billion, nine hundred seventeen million, forty-six thousand, one hundred twenty-one".