1651645231 has 2 divisors, whose sum is σ = 1651645232. Its totient is φ = 1651645230.

The previous prime is 1651645213. The next prime is 1651645241. The reversal of 1651645231 is 1325461561.

Together with previous prime (1651645213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (1325461561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1651645231 - 2⁵ = 1651645199 is a prime.

It is a super-2 number, since 2×1651645231² = 5455863938170086722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1651645241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825822615 + 825822616.

It is an arithmetic number, because the mean of its divisors is an integer number (825822616).

Almost surely, 2^1651645231 is an apocalyptic number.

1651645231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651645231 is an equidigital number, since it uses as much as digits as its factorization.

1651645231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 1651645231 is about 40640.4383711593. The cubic root of 1651645231 is about 1182.0583701276.

The spelling of 1651645231 in words is "one billion, six hundred fifty-one million, six hundred forty-five thousand, two hundred thirty-one".