1249551841 has 2 divisors, whose sum is σ = 1249551842. Its totient is φ = 1249551840.

The previous prime is 1249551773. The next prime is 1249551869. The reversal of 1249551841 is 1481559421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1245807616 + 3744225 = 35296^2 + 1935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249551841 - 2⁷ = 1249551713 is a prime.

It is a super-2 number, since 2×1249551841² = 3122759606692978562, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1249551794 and 1249551803.

It is not a weakly prime, because it can be changed into another prime (1249551341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624775920 + 624775921.

It is an arithmetic number, because the mean of its divisors is an integer number (624775921).

Almost surely, 2^1249551841 is an apocalyptic number.

It is an amenable number.

1249551841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249551841 is an equidigital number, since it uses as much as digits as its factorization.

1249551841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 40.

The square root of 1249551841 is about 35349.0005657869. Note that the first 3 decimals coincide. The cubic root of 1249551841 is about 1077.0885923881.

Subtracting from 1249551841 its sum of digits (40), we obtain a square (1249551801 = 35349²).

The spelling of 1249551841 in words is "one billion, two hundred forty-nine million, five hundred fifty-one thousand, eight hundred forty-one".