7542171997 has 2 divisors, whose sum is σ = 7542171998. Its totient is φ = 7542171996.

The previous prime is 7542171991. The next prime is 7542172039. The reversal of 7542171997 is 7991712457.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3841396441 + 3700775556 = 61979^2 + 60834^2 .

It is a cyclic number.

It is not a de Polignac number, because 7542171997 - 2¹⁵ = 7542139229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7542171991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3771085998 + 3771085999.

It is an arithmetic number, because the mean of its divisors is an integer number (3771085999).

Almost surely, 2^7542171997 is an apocalyptic number.

It is an amenable number.

7542171997 is a deficient number, since it is larger than the sum of its proper divisors (1).

7542171997 is an equidigital number, since it uses as much as digits as its factorization.

7542171997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1111320, while the sum is 52.

The square root of 7542171997 is about 86845.6792074309. The cubic root of 7542171997 is about 1961.0958051372.

The spelling of 7542171997 in words is "seven billion, five hundred forty-two million, one hundred seventy-one thousand, nine hundred ninety-seven".