1550053997 has 2 divisors, whose sum is σ = 1550053998. Its totient is φ = 1550053996.

The previous prime is 1550053979. The next prime is 1550054039. The reversal of 1550053997 is 7993500551.

Together with previous prime (1550053979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1346449636 + 203604361 = 36694^2 + 14269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1550053997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1550053957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775026998 + 775026999.

It is an arithmetic number, because the mean of its divisors is an integer number (775026999).

Almost surely, 2^1550053997 is an apocalyptic number.

It is an amenable number.

1550053997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1550053997 is an equidigital number, since it uses as much as digits as its factorization.

1550053997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 212625, while the sum is 44.

The square root of 1550053997 is about 39370.7251266725. The cubic root of 1550053997 is about 1157.3079659096.

The spelling of 1550053997 in words is "one billion, five hundred fifty million, fifty-three thousand, nine hundred ninety-seven".