126993691 has 8 divisors (see below), whose sum is σ = 138751344. Its totient is φ = 115271520.

The previous prime is 126993683. The next prime is 126993707. The reversal of 126993691 is 196399621.

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

It is a cyclic number.

It is not a de Polignac number, because 126993691 - 2³ = 126993683 is a prime.

It is a super-2 number, since 2×126993691² = 32254795107606962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126993631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1080 + ... + 15973.

It is an arithmetic number, because the mean of its divisors is an integer number (17343918).

Almost surely, 2^126993691 is an apocalyptic number.

126993691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

126993691 is a deficient number, since it is larger than the sum of its proper divisors (11757653).

126993691 is a wasteful number, since it uses less digits than its factorization.

126993691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17741.

The product of its digits is 157464, while the sum is 46.

The square root of 126993691 is about 11269.1477494973. The cubic root of 126993691 is about 502.6442459419.

The spelling of 126993691 in words is "one hundred twenty-six million, nine hundred ninety-three thousand, six hundred ninety-one".