1943949157 has 2 divisors, whose sum is σ = 1943949158. Its totient is φ = 1943949156.

The previous prime is 1943949149. The next prime is 1943949191. The reversal of 1943949157 is 7519493491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1533035716 + 410913441 = 39154^2 + 20271^2 .

It is a cyclic number.

It is not a de Polignac number, because 1943949157 - 2³ = 1943949149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1943949197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 971974578 + 971974579.

It is an arithmetic number, because the mean of its divisors is an integer number (971974579).

Almost surely, 2^1943949157 is an apocalyptic number.

It is an amenable number.

1943949157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1943949157 is an equidigital number, since it uses as much as digits as its factorization.

1943949157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 52.

The square root of 1943949157 is about 44090.2387949986. The cubic root of 1943949157 is about 1248.0394133143.

The spelling of 1943949157 in words is "one billion, nine hundred forty-three million, nine hundred forty-nine thousand, one hundred fifty-seven".