1631406243 has 4 divisors (see below), whose sum is σ = 2175208328. Its totient is φ = 1087604160.

The previous prime is 1631406239. The next prime is 1631406247. The reversal of 1631406243 is 3426041361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3426041361 = 3 ⋅1142013787.

It is an interprime number because it is at equal distance from previous prime (1631406239) and next prime (1631406247).

It is not a de Polignac number, because 1631406243 - 2² = 1631406239 is a prime.

It is a super-2 number, since 2×1631406243² = 5322972659398750098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1631406243.

It is not an unprimeable number, because it can be changed into a prime (1631406247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271901038 + ... + 271901043.

It is an arithmetic number, because the mean of its divisors is an integer number (543802082).

Almost surely, 2^1631406243 is an apocalyptic number.

1631406243 is a deficient number, since it is larger than the sum of its proper divisors (543802085).

1631406243 is an equidigital number, since it uses as much as digits as its factorization.

1631406243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543802084.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 1631406243 is about 40390.6702469766. The cubic root of 1631406243 is about 1177.2102638632.

The spelling of 1631406243 in words is "one billion, six hundred thirty-one million, four hundred six thousand, two hundred forty-three".