1625150521 has 2 divisors, whose sum is σ = 1625150522. Its totient is φ = 1625150520.

The previous prime is 1625150509. The next prime is 1625150531. The reversal of 1625150521 is 1250515261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1617648400 + 7502121 = 40220^2 + 2739^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625150521 - 2⁷ = 1625150393 is a prime.

It is a super-2 number, since 2×1625150521² = 5282228431813142882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1625150521.

It is not a weakly prime, because it can be changed into another prime (1625150531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812575260 + 812575261.

It is an arithmetic number, because the mean of its divisors is an integer number (812575261).

Almost surely, 2^1625150521 is an apocalyptic number.

It is an amenable number.

1625150521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625150521 is an equidigital number, since it uses as much as digits as its factorization.

1625150521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 1625150521 is about 40313.1556814894. The cubic root of 1625150521 is about 1175.7036427651.

Adding to 1625150521 its reverse (1250515261), we get a palindrome (2875665782).

The spelling of 1625150521 in words is "one billion, six hundred twenty-five million, one hundred fifty thousand, five hundred twenty-one".