7542621971 has 4 divisors (see below), whose sum is σ = 7609370952. Its totient is φ = 7475872992.

The previous prime is 7542621943. The next prime is 7542621979. The reversal of 7542621971 is 1791262457.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7542621971 is a prime.

It is a super-2 number, since 2×7542621971² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7542621979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33374321 + ... + 33374546.

It is an arithmetic number, because the mean of its divisors is an integer number (1902342738).

Almost surely, 2^7542621971 is an apocalyptic number.

7542621971 is a deficient number, since it is larger than the sum of its proper divisors (66748981).

7542621971 is a wasteful number, since it uses less digits than its factorization.

7542621971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66748980.

The product of its digits is 211680, while the sum is 44.

The square root of 7542621971 is about 86848.2698215687. The cubic root of 7542621971 is about 1961.1348047152.

The spelling of 7542621971 in words is "seven billion, five hundred forty-two million, six hundred twenty-one thousand, nine hundred seventy-one".