1201731541 has 2 divisors, whose sum is σ = 1201731542. Its totient is φ = 1201731540.

The previous prime is 1201731539. The next prime is 1201731563. The reversal of 1201731541 is 1451371021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 740384100 + 461347441 = 27210^2 + 21479^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201731541 - 2¹ = 1201731539 is a prime.

Together with 1201731539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201731511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600865770 + 600865771.

It is an arithmetic number, because the mean of its divisors is an integer number (600865771).

Almost surely, 2^1201731541 is an apocalyptic number.

It is an amenable number.

1201731541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201731541 is an equidigital number, since it uses as much as digits as its factorization.

1201731541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 1201731541 is about 34665.9997836497. Note that the first 3 decimals coincide. The cubic root of 1201731541 is about 1063.1694448945.

The spelling of 1201731541 in words is "one billion, two hundred one million, seven hundred thirty-one thousand, five hundred forty-one".