1251150121 has 4 divisors (see below), whose sum is σ = 1347392452. Its totient is φ = 1154907792.

The previous prime is 1251150101. The next prime is 1251150127. The reversal of 1251150121 is 1210511521.

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 831514896 + 419635225 = 28836^2 + 20485^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251150121 - 2¹⁵ = 1251117353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251150127) 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, 48121146 + ... + 48121171.

It is an arithmetic number, because the mean of its divisors is an integer number (336848113).

Almost surely, 2^1251150121 is an apocalyptic number.

It is an amenable number.

1251150121 is a deficient number, since it is larger than the sum of its proper divisors (96242331).

1251150121 is an equidigital number, since it uses as much as digits as its factorization.

1251150121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96242330.

The product of its (nonzero) digits is 100, while the sum is 19.

The square root of 1251150121 is about 35371.6004868312. The cubic root of 1251150121 is about 1077.5476251508.

Adding to 1251150121 its reverse (1210511521), we get a palindrome (2461661642).

The spelling of 1251150121 in words is "one billion, two hundred fifty-one million, one hundred fifty thousand, one hundred twenty-one".