3121522145 has 16 divisors (see below), whose sum is σ = 4353505920. Its totient is φ = 2104191744.

The previous prime is 3121522139. The next prime is 3121522147. The reversal of 3121522145 is 5412251213.

3121522145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 3121522145 - 2¹⁶ = 3121456609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3121522147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 753752 + ... + 757881.

It is an arithmetic number, because the mean of its divisors is an integer number (272094120).

Almost surely, 2^3121522145 is an apocalyptic number.

3121522145 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3121522145 is a deficient number, since it is larger than the sum of its proper divisors (1231983775).

3121522145 is a wasteful number, since it uses less digits than its factorization.

3121522145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511704.

The product of its digits is 2400, while the sum is 26.

The square root of 3121522145 is about 55870.5838970741. The cubic root of 3121522145 is about 1461.4663045962.

Adding to 3121522145 its reverse (5412251213), we get a palindrome (8533773358).

The spelling of 3121522145 in words is "three billion, one hundred twenty-one million, five hundred twenty-two thousand, one hundred forty-five".