1249464781 has 2 divisors, whose sum is σ = 1249464782. Its totient is φ = 1249464780.

The previous prime is 1249464767. The next prime is 1249464829. The reversal of 1249464781 is 1874649421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 897302025 + 352162756 = 29955^2 + 18766^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249464781 - 2²¹ = 1247367629 is a prime.

It is a super-2 number, since 2×1249464781² = 3122324477918755922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1249464701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624732390 + 624732391.

It is an arithmetic number, because the mean of its divisors is an integer number (624732391).

Almost surely, 2^1249464781 is an apocalyptic number.

It is an amenable number.

1249464781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249464781 is an equidigital number, since it uses as much as digits as its factorization.

1249464781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 46.

The square root of 1249464781 is about 35347.7691092380. The cubic root of 1249464781 is about 1077.0635771499.

The spelling of 1249464781 in words is "one billion, two hundred forty-nine million, four hundred sixty-four thousand, seven hundred eighty-one".