1974526409 has 2 divisors, whose sum is σ = 1974526410. Its totient is φ = 1974526408.

The previous prime is 1974526397. The next prime is 1974526429. The reversal of 1974526409 is 9046254791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1958947600 + 15578809 = 44260^2 + 3947^2 .

It is a cyclic number.

It is not a de Polignac number, because 1974526409 - 2⁸ = 1974526153 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1974526429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987263204 + 987263205.

It is an arithmetic number, because the mean of its divisors is an integer number (987263205).

Almost surely, 2^1974526409 is an apocalyptic number.

It is an amenable number.

1974526409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974526409 is an equidigital number, since it uses as much as digits as its factorization.

1974526409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 1974526409 is about 44435.6434520757. The cubic root of 1974526409 is about 1254.5490586893.

The spelling of 1974526409 in words is "one billion, nine hundred seventy-four million, five hundred twenty-six thousand, four hundred nine".