1391698241 has 4 divisors (see below), whose sum is σ = 1391846400. Its totient is φ = 1391550084.

The previous prime is 1391698223. The next prime is 1391698249. The reversal of 1391698241 is 1428961931.

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: 1428961931 = 3463 ⋅412637.

It is a cyclic number.

It is not a de Polignac number, because 1391698241 - 2¹⁰ = 1391697217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1391698192 and 1391698201.

It is not an unprimeable number, because it can be changed into a prime (1391698249) 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, 58961 + ... + 79118.

It is an arithmetic number, because the mean of its divisors is an integer number (347961600).

Almost surely, 2^1391698241 is an apocalyptic number.

It is an amenable number.

1391698241 is a deficient number, since it is larger than the sum of its proper divisors (148159).

1391698241 is a wasteful number, since it uses less digits than its factorization.

1391698241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148158.

The product of its digits is 93312, while the sum is 44.

The square root of 1391698241 is about 37305.4719980863. The cubic root of 1391698241 is about 1116.4733459748.

The spelling of 1391698241 in words is "one billion, three hundred ninety-one million, six hundred ninety-eight thousand, two hundred forty-one".