1525421701 has 4 divisors (see below), whose sum is σ = 1531357452. Its totient is φ = 1519485952.

The previous prime is 1525421699. The next prime is 1525421717. The reversal of 1525421701 is 1071245251.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 807128100 + 718293601 = 28410^2 + 26801^2 .

It is a cyclic number.

It is not a de Polignac number, because 1525421701 - 2¹ = 1525421699 is a prime.

It is a super-2 number, since 2×1525421701² = 4653822731763466802, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1525421701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1525421761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2967490 + ... + 2968003.

It is an arithmetic number, because the mean of its divisors is an integer number (382839363).

Almost surely, 2^1525421701 is an apocalyptic number.

It is an amenable number.

1525421701 is a deficient number, since it is larger than the sum of its proper divisors (5935751).

1525421701 is an equidigital number, since it uses as much as digits as its factorization.

1525421701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5935750.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 1525421701 is about 39056.6473343527. The cubic root of 1525421701 is about 1151.1448462955.

Adding to 1525421701 its reverse (1071245251), we get a palindrome (2596666952).

The spelling of 1525421701 in words is "one billion, five hundred twenty-five million, four hundred twenty-one thousand, seven hundred one".