127643401 has 2 divisors, whose sum is σ = 127643402. Its totient is φ = 127643400.

The previous prime is 127643359. The next prime is 127643423. The reversal of 127643401 is 104346721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90725625 + 36917776 = 9525^2 + 6076^2 .

It is a cyclic number.

It is not a de Polignac number, because 127643401 - 2¹⁵ = 127610633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 127643401.

It is not a weakly prime, because it can be changed into another prime (127643431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63821700 + 63821701.

It is an arithmetic number, because the mean of its divisors is an integer number (63821701).

Almost surely, 2^127643401 is an apocalyptic number.

It is an amenable number.

127643401 is a deficient number, since it is larger than the sum of its proper divisors (1).

127643401 is an equidigital number, since it uses as much as digits as its factorization.

127643401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 127643401 is about 11297.9379091939. The cubic root of 127643401 is about 503.4999778117.

The spelling of 127643401 in words is "one hundred twenty-seven million, six hundred forty-three thousand, four hundred one".