1357978541 has 2 divisors, whose sum is σ = 1357978542. Its totient is φ = 1357978540.

The previous prime is 1357978519. The next prime is 1357978543. The reversal of 1357978541 is 1458797531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1314352516 + 43626025 = 36254^2 + 6605^2 .

It is an emirp because it is prime and its reverse (1458797531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1357978541 - 2³⁰ = 284236717 is a prime.

Together with 1357978543, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1357978541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1357978543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678989270 + 678989271.

It is an arithmetic number, because the mean of its divisors is an integer number (678989271).

Almost surely, 2^1357978541 is an apocalyptic number.

It is an amenable number.

1357978541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1357978541 is an equidigital number, since it uses as much as digits as its factorization.

1357978541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 50.

The square root of 1357978541 is about 36850.7603856420. The cubic root of 1357978541 is about 1107.3824481728.

The spelling of 1357978541 in words is "one billion, three hundred fifty-seven million, nine hundred seventy-eight thousand, five hundred forty-one".