1535761921 has 2 divisors, whose sum is σ = 1535761922. Its totient is φ = 1535761920.

The previous prime is 1535761901. The next prime is 1535761939. The reversal of 1535761921 is 1291675351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 800267521 + 735494400 = 28289^2 + 27120^2 .

It is a cyclic number.

It is not a de Polignac number, because 1535761921 - 2⁵ = 1535761889 is a prime.

It is a super-2 number, since 2×1535761921² = 4717129355987220482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1535761901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 767880960 + 767880961.

It is an arithmetic number, because the mean of its divisors is an integer number (767880961).

Almost surely, 2^1535761921 is an apocalyptic number.

It is an amenable number.

1535761921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1535761921 is an equidigital number, since it uses as much as digits as its factorization.

1535761921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56700, while the sum is 40.

The square root of 1535761921 is about 39188.7984123014. The cubic root of 1535761921 is about 1153.7400404338.

The spelling of 1535761921 in words is "one billion, five hundred thirty-five million, seven hundred sixty-one thousand, nine hundred twenty-one".