1397771172501 has 16 divisors (see below), whose sum is σ = 2033180535360. Its totient is φ = 847109531520.

The previous prime is 1397771172431. The next prime is 1397771172527. The reversal of 1397771172501 is 1052711777931.

It is a happy number.

It is not a de Polignac number, because 1397771172501 - 2¹⁸ = 1397770910357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397771172401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579555 + ... + 1769583.

It is an arithmetic number, because the mean of its divisors is an integer number (127073783460).

Almost surely, 2^{1397771172501} is an apocalyptic number.

1397771172501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1397771172501 is a deficient number, since it is larger than the sum of its proper divisors (635409362859).

1397771172501 is a wasteful number, since it uses less digits than its factorization.

1397771172501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225636.

The product of its (nonzero) digits is 648270, while the sum is 51.

The spelling of 1397771172501 in words is "one trillion, three hundred ninety-seven billion, seven hundred seventy-one million, one hundred seventy-two thousand, five hundred one".