15123123451 has 2 divisors, whose sum is σ = 15123123452. Its totient is φ = 15123123450.

The previous prime is 15123123443. The next prime is 15123123523. The reversal of 15123123451 is 15432132151.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15123123451 - 2³ = 15123123443 is a prime.

It is a super-2 number, since 2×15123123451² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15123123151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7561561725 + 7561561726.

It is an arithmetic number, because the mean of its divisors is an integer number (7561561726).

Almost surely, 2^15123123451 is an apocalyptic number.

15123123451 is a deficient number, since it is larger than the sum of its proper divisors (1).

15123123451 is an equidigital number, since it uses as much as digits as its factorization.

15123123451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 28.

The spelling of 15123123451 in words is "fifteen billion, one hundred twenty-three million, one hundred twenty-three thousand, four hundred fifty-one".