1254249391 has 4 divisors (see below), whose sum is σ = 1297499400. Its totient is φ = 1210999384.

The previous prime is 1254249389. The next prime is 1254249407. The reversal of 1254249391 is 1939424521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1939424521 = 151 ⋅12843871.

It is a cyclic number.

It is not a de Polignac number, because 1254249391 - 2¹ = 1254249389 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 (1254249301) 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, 21624961 + ... + 21625018.

It is an arithmetic number, because the mean of its divisors is an integer number (324374850).

Almost surely, 2^1254249391 is an apocalyptic number.

1254249391 is a deficient number, since it is larger than the sum of its proper divisors (43250009).

1254249391 is an equidigital number, since it uses as much as digits as its factorization.

1254249391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43250008.

The product of its digits is 77760, while the sum is 40.

The square root of 1254249391 is about 35415.3835359720. The cubic root of 1254249391 is about 1078.4366357774.

The spelling of 1254249391 in words is "one billion, two hundred fifty-four million, two hundred forty-nine thousand, three hundred ninety-one".