349961921 has 2 divisors, whose sum is σ = 349961922. Its totient is φ = 349961920.

The previous prime is 349961897. The next prime is 349961929. The reversal of 349961921 is 129169943.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 233753521 + 116208400 = 15289^2 + 10780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-349961921 is a prime.

It is not a weakly prime, because it can be changed into another prime (349961929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174980960 + 174980961.

It is an arithmetic number, because the mean of its divisors is an integer number (174980961).

Almost surely, 2^349961921 is an apocalyptic number.

It is an amenable number.

349961921 is a deficient number, since it is larger than the sum of its proper divisors (1).

349961921 is an equidigital number, since it uses as much as digits as its factorization.

349961921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 44.

The square root of 349961921 is about 18707.2692021043. The cubic root of 349961921 is about 704.7043147473.

The spelling of 349961921 in words is "three hundred forty-nine million, nine hundred sixty-one thousand, nine hundred twenty-one".