1975138247 has 4 divisors (see below), whose sum is σ = 2038852416. Its totient is φ = 1911424080.

The previous prime is 1975138241. The next prime is 1975138259. The reversal of 1975138247 is 7428315791.

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

It is a cyclic number.

It is not a de Polignac number, because 1975138247 - 2¹⁶ = 1975072711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1975138241) 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, 31857038 + ... + 31857099.

It is an arithmetic number, because the mean of its divisors is an integer number (509713104).

Almost surely, 2^1975138247 is an apocalyptic number.

1975138247 is a deficient number, since it is larger than the sum of its proper divisors (63714169).

1975138247 is an equidigital number, since it uses as much as digits as its factorization.

1975138247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63714168.

The product of its digits is 423360, while the sum is 47.

The square root of 1975138247 is about 44442.5274596304. The cubic root of 1975138247 is about 1254.6786258798.

The spelling of 1975138247 in words is "one billion, nine hundred seventy-five million, one hundred thirty-eight thousand, two hundred forty-seven".