743531571961 has 2 divisors, whose sum is σ = 743531571962. Its totient is φ = 743531571960.

The previous prime is 743531571953. The next prime is 743531571977. The reversal of 743531571961 is 169175135347.

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., 680387420736 + 63144151225 = 824856^2 + 251285^2 .

It is a cyclic number.

It is not a de Polignac number, because 743531571961 - 2³ = 743531571953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 743531571899 and 743531571908.

It is not a weakly prime, because it can be changed into another prime (743531571661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371765785980 + 371765785981.

It is an arithmetic number, because the mean of its divisors is an integer number (371765785981).

Almost surely, 2^743531571961 is an apocalyptic number.

It is an amenable number.

743531571961 is a deficient number, since it is larger than the sum of its proper divisors (1).

743531571961 is an equidigital number, since it uses as much as digits as its factorization.

743531571961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2381400, while the sum is 52.

The spelling of 743531571961 in words is "seven hundred forty-three billion, five hundred thirty-one million, five hundred seventy-one thousand, nine hundred sixty-one".