1555147797 has 16 divisors (see below), whose sum is σ = 2420170752. Its totient is φ = 869747760.

The previous prime is 1555147771. The next prime is 1555147801. The reversal of 1555147797 is 7977415551.

It is not a de Polignac number, because 1555147797 - 2⁶ = 1555147733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555147757) 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, 786829 + ... + 788802.

It is an arithmetic number, because the mean of its divisors is an integer number (151260672).

Almost surely, 2^1555147797 is an apocalyptic number.

It is an amenable number.

1555147797 is a deficient number, since it is larger than the sum of its proper divisors (865022955).

1555147797 is a wasteful number, since it uses less digits than its factorization.

1555147797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575688.

The product of its digits is 1543500, while the sum is 51.

The square root of 1555147797 is about 39435.3622653577. The cubic root of 1555147797 is about 1158.5742980478.

The spelling of 1555147797 in words is "one billion, five hundred fifty-five million, one hundred forty-seven thousand, seven hundred ninety-seven".