15121545401 has 2 divisors, whose sum is σ = 15121545402. Its totient is φ = 15121545400.

The previous prime is 15121545391. The next prime is 15121545403. The reversal of 15121545401 is 10454512151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9312057001 + 5809488400 = 96499^2 + 76220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15121545401 is a prime.

It is a super-2 number, since 2×15121545401² (a number of 21 digits) contains 22 as substring.

Together with 15121545403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15121545403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7560772700 + 7560772701.

It is an arithmetic number, because the mean of its divisors is an integer number (7560772701).

Almost surely, 2^15121545401 is an apocalyptic number.

It is an amenable number.

15121545401 is a deficient number, since it is larger than the sum of its proper divisors (1).

15121545401 is an equidigital number, since it uses as much as digits as its factorization.

15121545401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 29.

The spelling of 15121545401 in words is "fifteen billion, one hundred twenty-one million, five hundred forty-five thousand, four hundred one".