1835152421 has 2 divisors, whose sum is σ = 1835152422. Its totient is φ = 1835152420.

The previous prime is 1835152379. The next prime is 1835152457. The reversal of 1835152421 is 1242515381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1024896196 + 810256225 = 32014^2 + 28465^2 .

It is an emirp because it is prime and its reverse (1242515381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1835152421 - 2²² = 1830958117 is a prime.

It is a super-2 number, since 2×1835152421² = 6735568816604322482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1835152471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 917576210 + 917576211.

It is an arithmetic number, because the mean of its divisors is an integer number (917576211).

Almost surely, 2^1835152421 is an apocalyptic number.

It is an amenable number.

1835152421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1835152421 is an equidigital number, since it uses as much as digits as its factorization.

1835152421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 32.

The square root of 1835152421 is about 42838.6790295873. The cubic root of 1835152421 is about 1224.3080742766.

The spelling of 1835152421 in words is "one billion, eight hundred thirty-five million, one hundred fifty-two thousand, four hundred twenty-one".