1293223261 has 4 divisors (see below), whose sum is σ = 1410789024. Its totient is φ = 1175657500.

The previous prime is 1293223259. The next prime is 1293223273. The reversal of 1293223261 is 1623223921.

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: 1623223921 = 11 ⋅147565811.

It is a cyclic number.

It is not a de Polignac number, because 1293223261 - 2¹ = 1293223259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1293223661) 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, 58782865 + ... + 58782886.

It is an arithmetic number, because the mean of its divisors is an integer number (352697256).

Almost surely, 2^1293223261 is an apocalyptic number.

1293223261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1293223261 is a deficient number, since it is larger than the sum of its proper divisors (117565763).

1293223261 is a wasteful number, since it uses less digits than its factorization.

1293223261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117565762.

The product of its digits is 7776, while the sum is 31.

The square root of 1293223261 is about 35961.4135011404. The cubic root of 1293223261 is about 1089.4931462180.

The spelling of 1293223261 in words is "one billion, two hundred ninety-three million, two hundred twenty-three thousand, two hundred sixty-one".