126991533 has 8 divisors (see below), whose sum is σ = 176683968. Its totient is φ = 80980064.

The previous prime is 126991499. The next prime is 126991549. The reversal of 126991533 is 335199621.

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 126991533 - 2¹² = 126987437 is a prime.

It is a super-2 number, since 2×126991533² = 32253698907380178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 126991491 and 126991500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126990533) 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, 920160 + ... + 920297.

It is an arithmetic number, because the mean of its divisors is an integer number (22085496).

Almost surely, 2^126991533 is an apocalyptic number.

It is an amenable number.

126991533 is a deficient number, since it is larger than the sum of its proper divisors (49692435).

126991533 is a wasteful number, since it uses less digits than its factorization.

126991533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840483.

The product of its digits is 43740, while the sum is 39.

The square root of 126991533 is about 11269.0520009449. The cubic root of 126991533 is about 502.6413987862.

The spelling of 126991533 in words is "one hundred twenty-six million, nine hundred ninety-one thousand, five hundred thirty-three".