1391279129025 has 24 divisors (see below), whose sum is σ = 2300289230400. Its totient is φ = 742002287040.

The previous prime is 1391279129021. The next prime is 1391279129027. The reversal of 1391279129025 is 5209219721931.

It is not a de Polignac number, because 1391279129025 - 2² = 1391279129021 is a prime.

It is a super-2 number, since 2×1391279129025² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1391279129021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5225019 + ... + 5484831.

It is an arithmetic number, because the mean of its divisors is an integer number (95845384600).

Almost surely, 2^{1391279129025} is an apocalyptic number.

1391279129025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1391279129025 is a deficient number, since it is larger than the sum of its proper divisors (909010101375).

1391279129025 is a wasteful number, since it uses less digits than its factorization.

1391279129025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331225 (or 331220 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 51.

The spelling of 1391279129025 in words is "one trillion, three hundred ninety-one billion, two hundred seventy-nine million, one hundred twenty-nine thousand, twenty-five".