1297111555 has 16 divisors (see below), whose sum is σ = 1599459840. Its totient is φ = 1009276128.

The previous prime is 1297111511. The next prime is 1297111583. The reversal of 1297111555 is 5551117921.

It is a cyclic number.

It is not a de Polignac number, because 1297111555 - 2²¹ = 1295014403 is a prime.

It is a super-2 number, since 2×1297111555² = 3364996772229036050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38764 + ... + 64006.

It is an arithmetic number, because the mean of its divisors is an integer number (99966240).

Almost surely, 2^1297111555 is an apocalyptic number.

1297111555 is a deficient number, since it is larger than the sum of its proper divisors (302348285).

1297111555 is a wasteful number, since it uses less digits than its factorization.

1297111555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25530.

The product of its digits is 15750, while the sum is 37.

The square root of 1297111555 is about 36015.4349550300. The cubic root of 1297111555 is about 1090.5839687084.

The spelling of 1297111555 in words is "one billion, two hundred ninety-seven million, one hundred eleven thousand, five hundred fifty-five".