75426991 has 2 divisors, whose sum is σ = 75426992. Its totient is φ = 75426990.

The previous prime is 75426983. The next prime is 75427013. The reversal of 75426991 is 19962457.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19962457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75426991 - 2³ = 75426983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75426931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37713495 + 37713496.

It is an arithmetic number, because the mean of its divisors is an integer number (37713496).

Almost surely, 2^75426991 is an apocalyptic number.

75426991 is a deficient number, since it is larger than the sum of its proper divisors (1).

75426991 is an equidigital number, since it uses as much as digits as its factorization.

75426991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 75426991 is about 8684.8713864973. The cubic root of 75426991 is about 422.5151256796.

The spelling of 75426991 in words is "seventy-five million, four hundred twenty-six thousand, nine hundred ninety-one".