15122087987 has 2 divisors, whose sum is σ = 15122087988. Its totient is φ = 15122087986.

The previous prime is 15122087983. The next prime is 15122088017. The reversal of 15122087987 is 78978022151.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15122087987 - 2² = 15122087983 is a prime.

It is not a weakly prime, because it can be changed into another prime (15122087983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7561043993 + 7561043994.

It is an arithmetic number, because the mean of its divisors is an integer number (7561043994).

Almost surely, 2^15122087987 is an apocalyptic number.

15122087987 is a deficient number, since it is larger than the sum of its proper divisors (1).

15122087987 is an equidigital number, since it uses as much as digits as its factorization.

15122087987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 564480, while the sum is 50.

The spelling of 15122087987 in words is "fifteen billion, one hundred twenty-two million, eighty-seven thousand, nine hundred eighty-seven".