1536671921 has 2 divisors, whose sum is σ = 1536671922. Its totient is φ = 1536671920.

The previous prime is 1536671893. The next prime is 1536671977. The reversal of 1536671921 is 1291766351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1357111921 + 179560000 = 36839^2 + 13400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1536671921 - 2¹⁴ = 1536655537 is a prime.

It is a super-2 number, since 2×1536671921² = 4722721185579660482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1536671221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 768335960 + 768335961.

It is an arithmetic number, because the mean of its divisors is an integer number (768335961).

Almost surely, 2^1536671921 is an apocalyptic number.

It is an amenable number.

1536671921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1536671921 is an equidigital number, since it uses as much as digits as its factorization.

1536671921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 41.

The square root of 1536671921 is about 39200.4071534978. The cubic root of 1536671921 is about 1153.9678743884.

The spelling of 1536671921 in words is "one billion, five hundred thirty-six million, six hundred seventy-one thousand, nine hundred twenty-one".