1541625121 has 4 divisors (see below), whose sum is σ = 1577476912. Its totient is φ = 1505773332.

The previous prime is 1541625119. The next prime is 1541625139. The reversal of 1541625121 is 1215261451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1541625121 - 2¹ = 1541625119 is a prime.

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 1541625121.

It is not an unprimeable number, because it can be changed into a prime (1541625191) 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, 17925831 + ... + 17925916.

It is an arithmetic number, because the mean of its divisors is an integer number (394369228).

Almost surely, 2^1541625121 is an apocalyptic number.

It is an amenable number.

1541625121 is a deficient number, since it is larger than the sum of its proper divisors (35851791).

1541625121 is an equidigital number, since it uses as much as digits as its factorization.

1541625121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35851790.

The product of its digits is 2400, while the sum is 28.

The square root of 1541625121 is about 39263.5342398007. The cubic root of 1541625121 is about 1155.2064175094.

Adding to 1541625121 its reverse (1215261451), we get a palindrome (2756886572).

The spelling of 1541625121 in words is "one billion, five hundred forty-one million, six hundred twenty-five thousand, one hundred twenty-one".