1951485521 has 2 divisors, whose sum is σ = 1951485522. Its totient is φ = 1951485520.

The previous prime is 1951485509. The next prime is 1951485527. The reversal of 1951485521 is 1255841591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1610898496 + 340587025 = 40136^2 + 18455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1951485521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1951485527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975742760 + 975742761.

It is an arithmetic number, because the mean of its divisors is an integer number (975742761).

Almost surely, 2^1951485521 is an apocalyptic number.

It is an amenable number.

1951485521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1951485521 is an equidigital number, since it uses as much as digits as its factorization.

1951485521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 41.

The square root of 1951485521 is about 44175.6213425459. The cubic root of 1951485521 is about 1249.6501465712.

The spelling of 1951485521 in words is "one billion, nine hundred fifty-one million, four hundred eighty-five thousand, five hundred twenty-one".