1630145331 has 14 divisors (see below), whose sum is σ = 2444101020. Its totient is φ = 1086763068.

The previous prime is 1630145219. The next prime is 1630145347. The reversal of 1630145331 is 1335410361.

It is not a de Polignac number, because 1630145331 - 2⁹ = 1630144819 is a prime.

It is a super-2 number, since 2×1630145331² = 5314747600362199122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1630145295 and 1630145304.

It is not an unprimeable number, because it can be changed into a prime (1630145381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1117341 + ... + 1118798.

Almost surely, 2^1630145331 is an apocalyptic number.

1630145331 is a deficient number, since it is larger than the sum of its proper divisors (813955689).

1630145331 is an frugal number, since it uses more digits than its factorization.

1630145331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236157 (or 2236142 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 1630145331 is about 40375.0582785957. The cubic root of 1630145331 is about 1176.9068975418.

Adding to 1630145331 its reverse (1335410361), we get a palindrome (2965555692).

The spelling of 1630145331 in words is "one billion, six hundred thirty million, one hundred forty-five thousand, three hundred thirty-one".