815451442 has 16 divisors (see below), whose sum is σ = 1322175960. Its totient is φ = 374959872.

The previous prime is 815451437. The next prime is 815451463. The reversal of 815451442 is 244154518.

It can be written as a sum of positive squares in 4 ways, for example, as 235653201 + 579798241 = 15351^2 + 24079^2 .

It is a super-2 number, since 2×815451442² = 1329922108519758728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 815451398 and 815451407.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51303 + ... + 65290.

Almost surely, 2^815451442 is an apocalyptic number.

815451442 is a deficient number, since it is larger than the sum of its proper divisors (506724518).

815451442 is a wasteful number, since it uses less digits than its factorization.

815451442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116877.

The product of its digits is 25600, while the sum is 34.

The square root of 815451442 is about 28556.1104144104. The cubic root of 815451442 is about 934.2562997679.

The spelling of 815451442 in words is "eight hundred fifteen million, four hundred fifty-one thousand, four hundred forty-two".