1251515400242 has 8 divisors (see below), whose sum is σ = 1958893670016. Its totient is φ = 598550843572.

The previous prime is 1251515400227. The next prime is 1251515400251. The reversal of 1251515400242 is 2420045151521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1251515400199 and 1251515400208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13603428218 + ... + 13603428309.

It is an arithmetic number, because the mean of its divisors is an integer number (244861708752).

Almost surely, 2^{1251515400242} is an apocalyptic number.

1251515400242 is a deficient number, since it is larger than the sum of its proper divisors (707378269774).

1251515400242 is a wasteful number, since it uses less digits than its factorization.

1251515400242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27206856552.

The product of its (nonzero) digits is 16000, while the sum is 32.

The spelling of 1251515400242 in words is "one trillion, two hundred fifty-one billion, five hundred fifteen million, four hundred thousand, two hundred forty-two".