1261457623 has 2 divisors, whose sum is σ = 1261457624. Its totient is φ = 1261457622.

The previous prime is 1261457621. The next prime is 1261457641. The reversal of 1261457623 is 3267541621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1261457623 - 2¹ = 1261457621 is a prime.

Together with 1261457621, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261457621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630728811 + 630728812.

It is an arithmetic number, because the mean of its divisors is an integer number (630728812).

Almost surely, 2^1261457623 is an apocalyptic number.

1261457623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261457623 is an equidigital number, since it uses as much as digits as its factorization.

1261457623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 1261457623 is about 35517.0047019734. The cubic root of 1261457623 is about 1080.4986332014.

The spelling of 1261457623 in words is "one billion, two hundred sixty-one million, four hundred fifty-seven thousand, six hundred twenty-three".