1231402993 has 4 divisors (see below), whose sum is σ = 1231580160. Its totient is φ = 1231225828.

The previous prime is 1231402969. The next prime is 1231402999. The reversal of 1231402993 is 3992041321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3992041321 = 23197 ⋅172093.

It is a cyclic number.

It is not a de Polignac number, because 1231402993 - 2²¹ = 1229305841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231402999) 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, 77713 + ... + 92206.

It is an arithmetic number, because the mean of its divisors is an integer number (307895040).

Almost surely, 2^1231402993 is an apocalyptic number.

It is an amenable number.

1231402993 is a deficient number, since it is larger than the sum of its proper divisors (177167).

1231402993 is an equidigital number, since it uses as much as digits as its factorization.

1231402993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177166.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 1231402993 is about 35091.3521113108. The cubic root of 1231402993 is about 1071.8484928384.

The spelling of 1231402993 in words is "one billion, two hundred thirty-one million, four hundred two thousand, nine hundred ninety-three".