1525420261 has 2 divisors, whose sum is σ = 1525420262. Its totient is φ = 1525420260.

The previous prime is 1525420249. The next prime is 1525420307. The reversal of 1525420261 is 1620245251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 905709025 + 619711236 = 30095^2 + 24894^2 .

It is a cyclic number.

It is not a de Polignac number, because 1525420261 - 2⁷ = 1525420133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1525420361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 762710130 + 762710131.

It is an arithmetic number, because the mean of its divisors is an integer number (762710131).

Almost surely, 2^1525420261 is an apocalyptic number.

It is an amenable number.

1525420261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1525420261 is an equidigital number, since it uses as much as digits as its factorization.

1525420261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1525420261 is about 39056.6288995863. The cubic root of 1525420261 is about 1151.1444840680.

The spelling of 1525420261 in words is "one billion, five hundred twenty-five million, four hundred twenty thousand, two hundred sixty-one".